Married With Children.
All the Star Trek series. Watch the TOS pilot Where No Man Has Gone Before (I'm not counting The Cage). TNG by Season 3 (that was writers of course), DS9 once Worf joined and the Dominion War started, Voyager once 7 of 9 came in, Enterprise by the end got pretty decent.
I'd say Doctor Who as well but there's no trends it all depended on the writers and the effects plus the actor. Pertwee's arc was darker than Troughton who could do more than Hartnell (because he was the oldest guy) but all were good. Tom Baker was the best old school Doctor. The 80s Doctor Who was poor because the fifth and sixth Doctors weren't very good (I really dislike Peter Davison's portrayal even though the guy seems pretty cool) , the writing stunk, and the effects were cheaper. McCoy was decent but the show was pretty much over by that point, the production was awful, and the show got weird, and the Fox American movie, not very good. I loved Eccleston's dark take but Tennant took it to another level, and the last two guys have been very good as well.
Threes Company for me. I liked Mr. Furley much better than the Ropers and I know it's not popular, but Suzanne Sommer's Crissy got really boring because she was so ditzy. Priscilla Barnes as Terri was much better.