The thing about X-2 was it really was a step out there in terms of Final Fantasy. There first sequel to a game (FFX) for one. Two, was that it was a weird system in terms of leveling your character. FFX also was a bit awkward because of the sphere grid and such, but you could get used to it, and it still was based on acquiring experience.
The only thing I have found about FFXII that people aren't that into is the battle system.