No. I'll try my hardest, but I haven't finished all my games.
Notable games that I quit on:
Brood War, used the level cheat and watched the cutscenes after four missions with the Zerg campaign. I just didn't have the Vespene Gas to continue.
Warlords 3 because the stability issues are horrible with that game, but I made it to the last level in the campaign. Still bugs me a bit.
Gabriel Knight 2.
I haven't finished either NFS Underground nor have I finished Black and White, but I like those games, so those don't count, I guess. Once I'm over the fun of Diablo II, I'll try them out.
Terrible games I've completed
I did manage to finish Ultima:Ascension. They weren't joking about how terrible it was.
Tiberian Sun. Command and Conquer and Red Alert are fine. Tiberian Sun is C&C on crack and the cutscenes are torture. I can't even stand Joe Kucan as a villain, let alone a director.