One of the best sitcoms ever made and has had an everlasting impact on many more that came along. The on and off relationships, a place to hangout at, a hound character, a lot of one liners from this series..etc have been all picked up in almost every overrated sitcom that has come after this through 90s, 2000s and 2010s.
Cheers is the only sitcom to which I have an obbsessive emotional attachment because of that beautiful bar, Coach aka Ernie Pantusso, that beautiful theme song, most emotional sitcom ending..etc
Though it has some predictable jokes here and there, it never gets boring or depends on cheap laughs and boring stories to reach it's high points.