I find the Office to be often downright unfunny. Wilson's character and the weird relationship between him and that Jim dude is one of the better aspects of that show, however.
Carrel is a good comedy actor and can be quite hilarious, his character on the Office is just embaressing, though. The things he does aren't funny, they make me uncomfortable.
Never saw Office UK. I don't like the "embarassment" humour. Saying stupid shit and then having all the other characters look at you funny isn't my idea of a ripping good laugh. But whatever floats your boat.