I've seen nearly ever episode of Full House and Fresh Prince... but I honestly don't remember if I've seen the endings of those. I probably have, but they don't stick out. Some of the only endings that I know I've seen that stick out to me are:

The I.T. Crowd -I really enjoyed it. Not the best ending, but probably the best ending they could give for the show.

The Office (US) - The last few seasons were absolutely awful with only some good moments here and there, but the ending was pretty satisfying. Yes, the show should have ended a lot sooner, but they did well with what they had by that final episode.

The Office (UK) - Good.

Roseanne - Awful awful awful. I love this show way more than I should, and that final season, including the final episode, just felt like a smack in the face in a lot of ways. It was just so weird, too.

Family Matters - I honestly can't remember it, which may say a lot. This show was getting really weird as time went on, though.

Boy Meets World - Very satisfying, heartfelt ending. Again, a lot of people take issue with the later seasons (at least amongst my friends), but the ending was pretty great I felt. If I remember right, it had a lot of recycled footage, but it was a nice send off to the characters and a nice moment of looking back on everything they went through.

This is all I can think of off the top of my head. I feel like it's really hard to make a proper ending to a sitcom though, just from the nature of these kinds of shows.