CHEERS is a show that I used to try and make myself really like, and I honestly don't know why. Overall, I find the show only moderately funny, but there are some episodes (i.e. "Cliffie's Big Score" and "Thanksgiving Orphans") that are an absolute scream. They never fail to make me laugh.
I really like Coach on the show. He's poignant and funny, and just the right mix of goofiness to boot. When Woody came aboard, I liked him as well, but I still miss Coach. They sometimes leaned heavy into the country bumpkin dumbness of Woody a wee too much.
I'll second what others have said about Carla: I'm not the biggest fan at all. She isn't funny to me, only mean. There's a fine line between sarcasm and rudeness, and Carla falls consistently in the latter. I don't like Rhea Pearlman as an actress anyway.
I can't really decide whether I like the show better with Shelley Long or Kirstie Alley. It was probably better written, or at least better constructed, when Shelley was the female lead, but I feel like there was more air in the show once Kirstie came aboard, especially when they stopped pushing her and Sam as the new power-couple.
There was a time I owned the complete series of CHEERS on DVD (Amazon had it marked way down at one time), but I got rid of it some two years ago. I might skim an episode if I see it streaming anywhere, but it's not high on my to-do list.