I always preferred it when the stories were kept separate. When they start with this recent obsession with the long story arcs, I get frustrated. Makes me want the Daleks to win, just to stop all the "bad wolf" nonsense!
IT Crowd definitely got better as they went along. The first couple of series were patchy, but the last ones were hilarious. It's just different sorts of humour, I guess. To me, BB Theory falls into the same category as Friends, Will and Grace, Frazier and other US sitcoms. They are cleverly written, fast-paced and slick, but I don't really laugh at them. I might watch them if there's nothing else on.
Anyway, Doctor Who... I watched it again this morning. It definitely benefits from a second viewing - the plot twists made sense and I caught some of the lines that I had missed last night. The chemistry between Matt Smith, David Tennant and John Hurt was brilliant.