Well...I finished Cheers over the weekend.
From the point of view of someone who binged it over the course of a few months, I felt it went on about 2-3 seasons too long. Sam had virtually no character growth. Rebecca started out as a good character, but she became ridiculous. Woody was solid for his entire run. Cliff and Norm were solid, but they obviously weren't the stars. Frasier and Lilith were mostly stellar - particularly Lilith. Diane's return at the end was nice, but I think the story they wrote for them was pretty flat. I particularly enjoyed the thing they did with John McLaughlin for the 200th episode (Shelley Long looked GREAT with darker hair).
I think I'm glad I watched Frasier first - IMO, it was FAR superior to its predecessor, and I'm looking forward to seeing what they do with the revival when it gets released later this year.
I started watching Wings, but I'm not sure I'll stick with it if it doesn't get more interesting (the first 8 or so episodes have been pretty snoozy, and it had one of the worst theme songs I can think of).