I think the Simpsons have shifted its humour though, like the first few sesons it was trying to be a sitcom, as the shows revolved around problems with bart, and family, as the show preogressed it became funnier as they revolved around homer and his schemes, probably the best writing for any comedy TV show, but the last few years its gotten so bizzare with the gags, and so random, its like there trying very hard to be funny. I am not saying its terrible, its still a great show, worthy of being on, but the quality dip is very noticable