Take each Doctor, compare them to what seems to you to be the overall fan consensus about them, and declare whether they are overrated, underrated, or correctly rated.
William Hartnell - UNDERRATED. He doesn't get nearly enough affection from the fans. In a way, I get it. He's hard to compare to any of the others because the Doctor's role on the show was so different back then. He wasn't the lead. It was more like "The Ian & Barbara Show" with the Doctor as this enigmatic instigator. But I love the 1st Doctor's brusque, no-nonsense attitude. And while he's generally known for being grumpy, he also had lots of moments of fun and whimsy, often giggling to himself because he was just so tickled by the mystique of the universe.
Patrick Troughton - UNDERRATED. When it comes to the hardcore fans, we all know how awesome Troughton is. But he's not nearly well known enough among casual fans. If a new series fan asked me which classic Doctor to start with, I would recommend Troughton, especially because he had such great chemistry with Jamie.
Jon Pertwee - CORRECTLY RATED. When you ask the average fan what they think about Jon Pertwee, the typical reaction tends to be a great deal of fondness but no real gushing. I think that's about right. There's not much to criticize with Pertwee but also not much to talk about.
Tom Baker - CORRECTLY RATED. Given how much people gush about Tom Baker, it would be so easy for him to be overrated except for one thing-- he absolutely deserves all of the hype that he gets.
Peter Davison - OVERRATED. Peter Davison is a great actor but he's too normal to be the Doctor. His overrated status has only gotten worse since "Time Crash," since it somehow gave the new series fans the impression that he's somehow interesting.
Colin Baker - UNDERRATED. He takes way too much crap from the fans, who too often scapegoat him for all of the other problems that the show had during his era. He definitely had some bad moments at the beginning but there was so much wasted potential there. Even the costume grows on you if you give it a chance.
Sylvester McCoy - Uhhhhhhhhh, I don't even know.
What IS the fan consensus on McCoy these days? I remember back before the new series when he was considered the hip, edgy Doctor. I don't know that fans think that so much any more. But I'm not sure what the current perception is. I think his Doctor has been somewhat overwhelmed by how bad the overall production quality was during his era. It's very '80s in a way that is only destined to become more & more dated as time goes by, never actually circling back around to become "retro." (I really like Ace though.)
Paul McGann - UNDERRATED. Or perhaps just underexposed. Even a handful of Big Finish audios should be enough to convince anyone that he's one of the greats.
Christopher Eccleston - CORRECTLY RATED. He's another Doctor where it's kinda hard to gauge the fan consensus. He generally gets overshadowed by Tennant and his era often feels more like a prelude to the Tennant years rather than its own thing. That's probably not fair. But at the same time, merely by being a new series Doctor, that tends to give him a cachet that makes people rank him above classics like Troughton & Pertwee. And that's just crazy talk!
David Tennant - SO GODDAMN OVERRATED! It seems like so many modern fans treat him like he's the be-all-end-all of Doctors. IMO, he's strictly middle tier. He's a little too human and a little too sexy to be a proper Doctor. But then, it's hard for me to hold it against him too much because, in interviews, he seems so charming and so devoted to the show & the fans. I may not like the 10th Doctor as much as most people. But the show couldn't possibly ask for a better brand ambassador.
Matt Smith - CORRECTLY RATED. I'm almost tempted to say overrated because I think he's very middle tier as well. But since he doesn't inspire quite the level of fan devotion that Tennant gets, I suppose his assessment is generally fair.
Peter Capaldi - CRIMINALLY UNDERRATED. I absolutely adore Capaldi and it breaks my heart whenever I talk to friends of mine who say that they gave up after his first season.
He can hold my attention just by monologuing in the TARDIS to absolutely no one. 
Jodie Whittaker - UNDERRATED. Even though I'm not at all a fan of her era so far, I think that she's the best thing about it. She's only a middle tier Doctor at best but she at least feels Doctor-y. I sometimes think that all she needs is one really good guest script by Moffat to make me fall in love with her.
What are your assessments of the Doctors?
William Hartnell - UNDERRATED. He doesn't get nearly enough affection from the fans. In a way, I get it. He's hard to compare to any of the others because the Doctor's role on the show was so different back then. He wasn't the lead. It was more like "The Ian & Barbara Show" with the Doctor as this enigmatic instigator. But I love the 1st Doctor's brusque, no-nonsense attitude. And while he's generally known for being grumpy, he also had lots of moments of fun and whimsy, often giggling to himself because he was just so tickled by the mystique of the universe.
Patrick Troughton - UNDERRATED. When it comes to the hardcore fans, we all know how awesome Troughton is. But he's not nearly well known enough among casual fans. If a new series fan asked me which classic Doctor to start with, I would recommend Troughton, especially because he had such great chemistry with Jamie.
Jon Pertwee - CORRECTLY RATED. When you ask the average fan what they think about Jon Pertwee, the typical reaction tends to be a great deal of fondness but no real gushing. I think that's about right. There's not much to criticize with Pertwee but also not much to talk about.
Tom Baker - CORRECTLY RATED. Given how much people gush about Tom Baker, it would be so easy for him to be overrated except for one thing-- he absolutely deserves all of the hype that he gets.
Peter Davison - OVERRATED. Peter Davison is a great actor but he's too normal to be the Doctor. His overrated status has only gotten worse since "Time Crash," since it somehow gave the new series fans the impression that he's somehow interesting.
Colin Baker - UNDERRATED. He takes way too much crap from the fans, who too often scapegoat him for all of the other problems that the show had during his era. He definitely had some bad moments at the beginning but there was so much wasted potential there. Even the costume grows on you if you give it a chance.
Sylvester McCoy - Uhhhhhhhhh, I don't even know.

Paul McGann - UNDERRATED. Or perhaps just underexposed. Even a handful of Big Finish audios should be enough to convince anyone that he's one of the greats.
Christopher Eccleston - CORRECTLY RATED. He's another Doctor where it's kinda hard to gauge the fan consensus. He generally gets overshadowed by Tennant and his era often feels more like a prelude to the Tennant years rather than its own thing. That's probably not fair. But at the same time, merely by being a new series Doctor, that tends to give him a cachet that makes people rank him above classics like Troughton & Pertwee. And that's just crazy talk!
David Tennant - SO GODDAMN OVERRATED! It seems like so many modern fans treat him like he's the be-all-end-all of Doctors. IMO, he's strictly middle tier. He's a little too human and a little too sexy to be a proper Doctor. But then, it's hard for me to hold it against him too much because, in interviews, he seems so charming and so devoted to the show & the fans. I may not like the 10th Doctor as much as most people. But the show couldn't possibly ask for a better brand ambassador.
Matt Smith - CORRECTLY RATED. I'm almost tempted to say overrated because I think he's very middle tier as well. But since he doesn't inspire quite the level of fan devotion that Tennant gets, I suppose his assessment is generally fair.
Peter Capaldi - CRIMINALLY UNDERRATED. I absolutely adore Capaldi and it breaks my heart whenever I talk to friends of mine who say that they gave up after his first season.


Jodie Whittaker - UNDERRATED. Even though I'm not at all a fan of her era so far, I think that she's the best thing about it. She's only a middle tier Doctor at best but she at least feels Doctor-y. I sometimes think that all she needs is one really good guest script by Moffat to make me fall in love with her.
What are your assessments of the Doctors?