FFX-2 was just an easy way for square to make quick cash which was needed at the time.

The older FF's had a lot of things that X-2 didn't: More than three characters; good characters; characters that didn't go from either A) Sad to Cheery B) Cheery to crack addicted OR C) Male to Female (Paine was such an Auron ripoff); A decent story; and most importantly new worlds.