I dislike the Doom and Quake games after Quake 2.
And Myth III (which wasn’t made by Bungie).
The original Atari Star Raiders was a classic and by far the best – the later versions weren’t very good.
Dungeon Master II was about as good as the first one, though didn’t add much new. Dungeon Master 3 did add some things, but didn’t seem as well done overall.
Tigers on the Prowl 3 has resisted my efforts to get into it, due to the UI.
Combat Mission got steadily better up until Berlin To Barbarossa, but the later games seemed so much worse that I stopped playing quickly.
The Space Empires games got steadily better until Space Empires V, where the new publisher wasn’t into letting the developer improve it for years like he had with the previous games, and it wasn’t really very finished, so I never got into it even though the space battles were spectacular to watch.