Why bother... It feels like SquareEnix didn't even try to make a good game like the first one.
The story mode sucks, I can't believe SquareEnix didn't even try... They decided to add a very short prequel and then add the original story of Dissidia. I felt ripped off as I paid for a new game and ended up getting almost the same game I bought before plus new characters and the assist mode.
The gameplay feels the same as Dissidia, its quick, easy and fun, there are some tweaks like the assist mode (which is not that helpful at all) , new characters and some new skills for the old ones.
If you got Dissidia, this game may not be for you, everytime I see it I feel like I paid money for unimportant tweaks rather than an improved game which is what I was so looking for... If you didn't play Dissidia then this game will give you a lot of fun for sure ^.^