I'd give Americans their more serious shows like The Wire, Game of Thrones, Boardwalk Empire, Sopranos etc, but aside from very very few exceptions their comedy is horrendous.
Two and a Half Men? How I Met Your Mother? The Big Bang Theory? Scrubs? These shows are not just all terrible but they are crimes against humanity.
I am an American, and I do not watch any of the sitcom crap! Please do not judge all of us as mindless idiots : ) I do like Family Guy, as well as the old Simpsons and Seinfeld re runs. House is a great drama with some comedy. The Soprano's was a tremdous series! I like The Tudors as well. I wish they would come out with a new season of Being Human. I was able to get it on BBC America. I watch mostly BBC America, The History Channel, Sundance Channel, Independent Film Channel, Biography, VHI Classic, etc. MTV has become a rerun of jackasses called Jersey Shore, which I am sure you already know.
I noticed no one mentioned Monty Python and the Flying Circus, the HOLY GRAIL of British comedy imo!