At times I've wondered if this show was overrated, but now that sitcoms have all dried up and blown away and TV is left with two-hour singing and dancing competitions and ten thousand graphic crime dramas, now I think that this show was exactly what so many Americans wanted to come home to. The premise and the characters just made for a lot of fun. It's a shame that the US version of "Coupling" went so terribly and failed to fill the void left on TV after "Friends" finished it's run.
I think the first season is my favorite. I've always liked the Gen X vibe it had in the first season, similar to movies like "Reality Bites" and "Singles", but that could only last so long before the characters had to grow up just like the rest of us.
I remember wishing the series finale had more to it, though.