I thought the first collections of Star Wars and Darth Vader were great. Most of the reaction I've seen to the two core OT era series has been positive overall, but the miniseries do seem a bit more mixed.
I've heard good things about
Darth Vader, not so much "Vader Down." The main
Star Wars ongoing is okay from what I've heard, as was the
Lando miniseries. Haven't heard much about
Kanan or the
Obi-Wan and Anakin series. I've heard very few good things about
Princess Leia or
Chewbacca.
I'm actually not a big comics person (really, the only exceptions are that I am trying to get all the pre-"Ultimatum"
Ultimate Spider-Man back issues and the
Star Wars: Knight Errant series and will be collecting
Amazing Spider-Man: Renew Your Vows when that comes out). However, if I was going to try canon
Star Wars comics,
Vader and the
Kanan series are the ones that sound interesting (Vader do to the good publicity and Kanan since I'm a
Rebels fan).
Know if the TFA comic book adaptation was any good?
It finally dawned on me why we were getting so many books and comics set between A New Hope and The Empire Strikes Back, it's the only period in the series where the big three were all together. They don't meet until part way through ANH, Han is in carbonite between Empire and Return of the Jedi, and if you go to after RotJ then you are heading into the New Republic era and the set up for The Force Awakens.
Hope they don't overdue stories in this era like they did before. Personally, I'm more interested in stuff involving TFA and its characters at the moment, than the original cast.

To me, they really couldn't be farther apart (outside of the names/armor, obviously).
Hmm. Guess we all process this stuff differently. I mean, I can kind of take or leave the Traviss Mandalorians, so that's maybe why I don't mind the changes?