It was something that occured to me especially when thinking about the thread regarding That Mitchell and Webb look, but also a lot of the other discussions of popular comedies.
I watched the above mentioned programme twice, once being overly cynical and once really trying to enjoy it (trying to emulate the way I watch an act who is on at my local Stand-up New Act Night) and the second time I managed to find most if not all of the sketches really funny and genuinely laughed out loud.
The long winded point I am making is do we watch TV comedy in a overly cynical way as a sort of defence mechanism so our own comedy efforts seem funnier in comparison. (And also in my case watch TV stuff in a cynical way so I can maintain my belief that Radio is better).