Matt Smith is my Doctor. Could be because he was my first proper Doctor, or just that his personality and storylines were more up my alley. He's simply the Doctor I enjoy the most. Surprised to see so much criticism of him, but each to their own I guess.
To give context, here are the Doctors I've watched and the order I've watched them in:
Matt Smith (11), Chris Eccleston (9), David Tennant (10), William Hartnell (1), Patrick Troughton (2), Jon Pertwee (3), Tom Baker (4), Peter Capaldi (12)
So there are a few classic Doctors I haven't watched yet. I think when ranging the other Doctors I like Tennant and Baker similarly as Doctors, Sarah Jane and Donna are two of my favourite companions, but I prefer Tennant's storylines to Baker's (of the ones I've seen), probably due to me being a bigger fan of overarching serialized storytelling rather than the enclosed adventures type storytelling of Classic Who, so I would probably put Tennant slightly ahead of Baker because I get a better overall experience watching him than I do Baker (unfair, I guess, but there you have it). I'm undecided on which I prefer out of Eccleston and Capaldi, each having their ups and downs, but out of the remaining Doctors I've seen I rank them Pertwee, then Hartnell, with Troughton coming last (his Doctor was the only one that I didn't warm up to).