Oh geez, another "graphics means more than it should" type of person. FFVII was one of the best (sold more than FFVIII and FFIX...I'm not sure about FFX).

Anyway, the one reason you should play this game: The Bahamut summon animation is AWESOME!
Well, that reason may not be good enough for you, but it really is awesome, if not legitly, you should at least use a GS just to see Bahamut (Doomtrain was pretty wicked, too).