The only good thing on this game is the soundtrack.
The idea itself was good, but the game was poorly executed. C'mon, beating the game once with every character to get the true story mode was ridiculous, I would rather a Quest mode, like Mortal Kombat's Konquest mode.
The character design itself was like IGA told Obata to make the characters look appealing to new players, so Obata decided to re-use his Death Note designs. Only Simon escaped this fate, he's from
Hikaru no Go (just check the red-haired guy).
I think they could have 'cloned' the mechanics from Soul Calibur Legends: every movement you do, the way you do, higher or lower, chances the attack. It would be awesome.
Another thing I enjoyed they gave personality to older characters, like Trevor, Grant, Sypha and Simon.
Instead of Golem, they needed a big strong character, I would had added Hammer from Aria/Dawn of Sorrow as a wrestler. It would be so funny XD
And meh. They removed Sonia from cannon :/