I liked the UK version with its satire of life in the modern workplace. No, it wasn't always funny in a laugh-out-loud sense (but sometimes was - "Freeway of Love", anyone?), but had a much darker message about unfulfilled aspirations, our own failings, and a fundamental lack of fairness in our lives and relationships. I thought it was brilliant. Anyone who didn't see their own character flaws regularly reflected back by the characters wasn't watching.
It also launched Martin Freeman's career, which ultimately gave us his great role in Fargo.