I started watching with the Fourth Doctor (Tom Baker). I also saw the Fifth and Sixth Doctors in the original runs.
My personal ranking of Doctors: Ninth, Fifth, Tenth, Fourth, Sixth, and Twelfth. I disliked Matt Smith intensely.
My favorites are all over the place: my favorite companion was Rory (though I hated Matt Smith) and my favorite episode was Midnight (with Doctor Ten showing why he REALLY needs a companion as a buffer between him and people).
I can't put my finger on why is don't like the episodes with Capaldi that much. He's a good actor and his companion is fascinating. It might just be that Moffat makes the show creepy in a bad way.