Love it. Grew up on it. Still my favorite sci-fi hero. Who-related tattoos are on the possibility list.
I'm a bit lukewarm on Smith. To his credit, he has a amazing naturalism for the role; off the bat he feels like the Doctor, and his choice to play a sort of mega-composite Doctor is interesting. Still, it's sort of like he sets the par. Also, with the way that Season 5 ended, I'm really looking forward to what happens next. Some of the best times on the show have been when there was more of an ensemble cast (2, 5), and the current group shows considerable promise.
Waters of Mars is a...problematic episode. The point of it, basically, is to serve as an emotional counterpoint for another episode, Fires of Pompeii, but it kind of falls flat in that regard, for the same reason that
falls flat: a lack of bravery on the part of the writers to pull the damn trigger after extended threats about it, a problem that, for its other weaknesses, old Who did not have.
I'm not big on Tennant, but some of that is RTD's writing, and some of that is that I prefer a different kind of Doctor, and some of that is my irritation at dealing with people who were Tennant fans rather than Doctor Who fans.
And yes, Pertwee is the Doctor. (Though, the idea of complaining about Rose, but then citing Pertwee...come on, Jo?) I used to consider Davidson my favorite, but after seeing some of the DVD releases with episodes that I haven't watched in ages, I'm compelled to give that to Pertwee, especially early Pertwee.