I get it from the fact that they never score, and they have low self-confidence, and act awkward around girls.
I don't care for the show, but I'm pretty brutal when it comes to TV shows. Comedy especially. I've got no patience for tropes and stereotypes. I like complex characters that can't be described in a short phrase, like "the liberal woman and her gay room-mate" or "four smart guys". I think American comedy relies too heavily on simplistic, stereotypical characters. British comedy appeals to me more, because the characters are more like actual people. (I'd mention Canadian comedy if we had any).
That said, I really enjoy the daily show, and the American version of the office is just a good as the British one, if not more so.