Oh too true, my friend, oh too true...

I've played 4, 6, 7, and 10. 10's the best overall because it has a very cohesive storyline, CTB (which is much better than ATB), the Sphere Grid, and awesome graphics and music. However, I definately agree that the ending was a major letdown. Fortunately, there is X-2.

As for best antagonist: Sephiroth takes top honors, although Kefka comes close.