Yes, I think that's a fair point to make Jeku, whilst I am mighty proud of British humour, it's not superior or inferior, just different. For people outside of the UK, it might seem like a breath of fresh air from other types of comedies.
Truth is, as much as I love our humour, there's American humour that can have me in stitches, whereas others make me think violent thoughts. Same applies here, I'm sorry but Catherine Tate is less funny than she is 'bovvered'.
American Office vs British Office, well...in my opinion the Office is not funny, but then it clearly is a comedy tailored towards those who have worked/work in an office environment. Mind you, I've not seen American Office, so the slapstick humour might tickle me a bit. Who knows?
However, stuff like Spaced, The IT Crowd, Black Books, many of the UK quiz shows (Nevermind The Buzzcocks, QI, Mock The Week, Have I Got News For You, Would I Lie to You and so on), That Mitchell and Webb Look and Peep Show are all pretty awesome.