There are plenty of terrific American comedies: Arrested Development, most of the NBC lineup - 30 Rock (esp s1,2,3), Community, The Office [at least the first few seasons, haven't really watched] (and I know, it isn't inherently a product of the US), It's Always Sunny in Philadelphia, and now I'm kinda drawing a blank.ZeroMachine said:Hey, we do come out with damn good shows on occasion. House started amazing and is still decent, Psych is pretty good and funny, and Avatar: The Last Airbender may be the best cartoon I've ever seen (and The Legend of Korra is looking to be just as good).
For the most part, though, as much as I hate the whole "it's America" statement... you are dead on with that.
The quality of our average TV show leaves much to be desired.
Also, I find The Sopranos to be perhaps the best TV show ever. I think that it is surprisingly reflective of the human condition for all ages and that it captures the medium of television perfectly.
EDIT: Oh, duh. South Park and The Simpsons; both amazing.