I think you should. If you enjoyed Storm 2 and Gen, you can pick up this one too. Story mode is good, the three boss battles are entertaining and some of the combat mechanices are kind of better. Definitely worth picking up if you're a fan of explosive ougis and part 1 as well.
You can get a collector's edition for like $25
PSN:GodlessChaos. Official Rikudo Naruto of the Storm 3 boards. Waiting for Storm 3, Tales of Hearts R,Project Jump, OP Pirate Warriors 2.