As far as comedy goes, if the latest medical comedies are anything to go by, the US isn't doing badly for itself.
Scrubs (US) = One of the funniest programmes on TV.
TLC (UK) = Absolute toejame.
There are still good UK comedies around (such as Black Books) as well as longer-running ones but many of them seem to try and copy US types of humour - and fail completely. British-made TV's declining anyway, which is a shame since it used to be innovative, if low budget, in areas like science fiction.