I've just finished watching part of my Christmas present - the DVD boxset of Doctor Who Season 2 (OK, I confess, I've still got the "Doctor Who Confidential" and David Tennant's video diaries to watch - and boy, am I looking forward to the latter ?!), which was David Tennant's first season in the role of the Doctor.
I had watched the series before after my brother kindly taped it for me (I don't have access to broadcast television), but watching it all over again was my post-Cybils treat - and what a treat. The only real stinker of an episode was "Love and Monsters", which was just utterly silly and not worth watching in full a second time (I fast-forwarded through most of it - stopping just to watch the Doctor and Rose).
My favourite episodes are "The Girl in the Fireplace", in which the Doctor meets Madame de Pompadour - and saves her life (and gets giddy with excitement when she kisses him (lucky woman !)) when some clockwork robots want to capture her; "School Reunion", in which the Doctor meets up with Sarah Jane Smith, who was the Doctor's assistant during his third reincarnation (played by Jon Pertwee) and his fourth reincarnation (played by Tom Baker), and they fight a character played by Anthony Steward Head (two lovely men in one episode !); and "The Idiot's Lantern", which features Maureen Lipman in quite possibly her scariest role ever !
Some viewers have criticised Tennant's portrayal of the Doctor as too wacky, but I think a 900+ year old time-travelling alien would be a bit wacky ! And after the very serious (mostly) Ninth Doctor (played by Christopher Ecclestone), a mostly cheerful Tenth Doctor made a nice change.