There aren't very many shows that I deem almost (or absolutely) perfect. 'Cheers' is, by far, definitely one of them. On the top. 'Seinfeld', 'Roseanne', 'Bewitched', 'Frasier'...(Those are just a few of the others that I think are great.)
'Cheers' is the perfect show because it has something for everyone. There are so many different character personalities to chose from in that one, simple bar that you can't NOT have a favorite. I don't think anyone (anyone that's ever watched the show) could say "I don't like it, I don't like any of them!" ...But how could you not? For the people that want an (at least) semi-intellectual character (instead of everyone being a complete moron) they have Frasier, Diane, Lilith. Everyone loves Norm's witty one-liners as he enters the bar. Coach and Woody are goofily funny in their own stupidity. Carla has her crude, sarcastic zingers. Sam and his "little black book." Cliff with his "know-it-all" attitude when in actuality he doesn't know a thing. Rebecca's a great, all-around character...
It also has the backup of being CONSTANTLY funny, some episodes aren't completely boring, then the next, twenty times funnier than the one before (though, I admit, some are absolutely hilarious!) It gets better and better with each year, not old and drawn out, just more jokes! That's why it lasted so long.
So, if any of you read this, look in you're TV guides to see when it's on. After just a few, you'll know and love the characters, and you'll be completely hooked!