Just finished FFX. I'm giving it a 8.5 Only because I felt the leveling progression is a bit week and you're ultimate weapons are near impossible to get before the final fight. I did manage to get yuna's and I guess that all you really need, but I would have liked a few more. Also I never felt that I was bad dog enough. Not like in past FF games. But a very good game over all. If these things where different then I could give it an 9.Psh, you need to work on leveling up more and screw ultimate weapons.
Great way to level up is to go to the monster arena.