Ricky Gervais' shows such as The Office and Extras were bloody awful in my opinion. However, he is decent at stand-up, so he gets let off... For now.
Also I don't find Graham Norton (would we even call him a comedian?) very funny. Also Roy Chubby Brown sucks.He thinks he's Bernard Manning, God rest him...
Catherine Tate is also NOT FUNNY! Also, if you ever come across a show called Tittybangbang, that also sucks.