Maybe the games were too hard, or you didn't enjoy them all that much to play through a second time.
For me, the two Final Fantasy games that I beat: VII & X, I wouldn't replay again. Why? Because the first experiences were so good that it was enough. I don't want to affect my..."nostalgia" let's say. :P
Another one would be the original Rayman. It's tough. Good game, but beating it once was enough.
I don't think I'll revisit the Kingdom Hearts games either. Plus, imo 3 wasn't worth the wait.