I've played a good amount of this game. I'd agree with Skiwan that it's visually less impressive than some of the earlier titles.
The game probably plays better than any of the games from the Tenkaichi series. Honestly, the character selection was far greater in Tenkaichi 3, but its gameplay was clunky and the fighting animations pailed in comparison with Raging Blast's, in my opinion.
I suppose my only complaints so far are that it's well, yet another boring, uninventive DBZ game, and that it can be ridiculously hard. You actually aren't able to play some parts of the story without earning certain game items called "Stars", obtained through completing special missions, including some that have you win matches on 'Hard' mode. This game is purely for DBZ fans- it sort of expresses: "If you aren't a vet, you can't play the whole game."
Anywho, I'm considering not even bothering finishing this game (At beginning of the Buu Saga). It's like, what else is there to see, ay? Practically every single part of the story that was actually original was wasted again, and tossed out as unimportant and skipped through a seemingly worse story mode, yet again.