I have the game and it takes me 2 hours to put a character lvl 50 by playing Story mode without extra EXP bonus, thought ... (I was playing with Cloud)
I like the game's system, the character customization, making infinite possibilities, and playing with your own style. Its the first time that I see a game that evolve while your playing.
I'm deceived 'bout the main game's story. I think that Square Enix could easily do better than this...
But I'm still giving 9.5/10 for Dissidia :D