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.