Terrestrial TV
Has been going downhill for about twenty years now, maybe thirty in the case of ITV (I can't remember watching anything good on that channel since the 80's). Channel Five has been shite since the start, of course. Four started with such promise, but when they bought Big Brother, everything went wrong.
I think it was Dyke who killed the uniqueness of the BBC, when he broke it all up in the early 90's (I think it was him - correct me if I'm wrong).