1. Seinfeld (1989-1998)
2. Scrubs (2001-2010)
3. Frasier (1993-2004)
4. 30 Rock (2006-2013)
5. Parks & Recreation (2009-2015)
I honestly haven't seen that many sitcoms tbh. I watched Seinfeld a fair bit while it was on reruns and the like and dug the characters and their quirky day to day lives in a show about nothing.
Scrubs was great but I never really saw the last few seasons, though apparently that was a good thing. Loveable characters in a teaching hospital setting, showing lots of different characters and personalities and all of them were at least partially sympathetic and most were complex and had complex relationships.
Frasier was a graet family dynamic and I liked the idea of a psychiatrist going through so many struggles. I liked the class/elitism themes as well.
30 Rock and Parks & Rec beat out Community I guess in my listing of NBC sitcoms that I watched if the time matched up. I saw enough of the former two to bother watching them on streaming platforms and enjoyed them both to the extent I remember a fair bit of both shows. I liked the self deprecation that occurred in both series, one at a television studio and the other in a small government thing. Lots of colorful characters with actual development. 30 Rock beats out Parks & Rec by being a bit less preachy and more self deprecating, with hilarious smash cuts and some genuine moments it de-evolved into absolute ridiculousness which was great.
I didn't add cartoons since while similar, I feel their animated nature should put them in a distinct category. And with that said its annoying because The Simpsons and South Park are still going on and I haven't seen an episode of either in years and in all honesty, especially in Simpsons case, probably should be mercykilled.