Since we're talking "traditional" that rules out Arrested Development, which is my favorite non-animated sitcom.
Uh, Wings? That's a classic? It was this boring show about people working at an airport that went on for like 10 years. It had Tony Shalhoub (who played a Hispanic immigrant) and Thomas Haden Church (who played a dumbass mechanic) in the cast and they went on to do good stuff, but aside from that...
I've sometimes considered watching Cheers maybe as sort of an 80s thing. I'm old enough to have watched the series finale when I was 11, which I got really hyped up for, for some reason.