unlike most, I think "The Unicorn and the Wasp" was wonderful
Hear, hear.
Aside from "The Doctor's Daughter", I think every episode in Series Four is brilliant. It's easily the best overall for my money.
Series Three would be my second favorite. I liked Martha quite a bit (although I could have done without the unrequited love angle), and thought it's only really weak episode was "The Lazarus Experiment". I didn't really get into "The Shakespeare Code" that much but it does have its moments. The run from "Human Nature" to the end is incredible, "Last of the Time Lords" included. And while I'm outing myself on liking unpopular episodes, I thought "Daleks In Manhattan"/"Evolution of the Daleks" was great. Pig men and all.
If you had asked me a few weeks ago, I'd have put Series Two on the bottom, but I just got it on DVD last week and rewatching it I found I liked it more than I remembered. It does suffer from having two of the weakest episodes in the series run ("Love & Monsters", which might have been okay with a better ending, and "Fear Her" which isn't really bad, just boring). Other than that, I find "New Earth" grows on me, and the rest is great. I see "Tooth and Claw" hasn't gotten much love to date in this thread, so I'll mention I think it is awesome as well.
That leaves Series One to pull up the rear. For me it is very consistently good but rarely hits the high points of the later seasons. Still, episodes like "Dalek", "Father's Day", "The Empty Child"/"The Doctor Dances", and "Bad Wolf"/"Parting of the Ways" are standouts so I can't call it a weak sister by any stretch. The main problem for me is Eccleston, who is fine but rates in the middle of the pack for me.
Four series and not a bad one in the bunch. Well done, RTD.