The first game that comes to mind for me is Civilizations 4. I’ve probably spent hundreds of hours playing but after getting used to 5 and 6 I have a really hard time going back. Going back and forth between 5 and 6 I need to rethink some strategies but with 4 I feel like I need to rethink everything. I don’t know if it’s because of the tech tree layout in combination with the civics system, things like unit stacking, or maybe just a bunch of little things but it takes me a while to readjust.
I loved and hated Ultima VIII. It had a good story, was entertaining, had really good music, but it also had the most horrible jumping-on-moving-platforms torture of any game I have ever played. It also sent me on a quest they never implemented, a fact they forgot to tell the player.
Flashback was also a fantastic game, but I also do not ever want to play that again. I remember destroying a keyboard as a teen because I was so frustrated after missing the same stupid jump for the umpteenth time.
I really hate the feel of flashbacks controls. Like navigating on a grid. I really wanted more fluidity.