It's pretty okay, but not worth buying.
The game plays like Virtua Fighter on Prozac as IGN says. It's alright and pretty fun sometimes, but not too exciting like its Tenkaichi 2 or Budokai 3 sequels. Those are actually worth purchases. The super moves are cool and all, but there's not enough of them and many of them look alike.
While there's not too many characters as compared to later games like The DBZBT2 which has over 120. I think there's 30 something in this one. But anyway there's a bunch of modes and items to equip your character with and I guess that's just it. The story mode is long enough for the amount of time it covers. It's not bad, but still a rental even if you like DBZ. If you already bought it, then trick someone else into buying it.