Like the title says, its not a great game. The game could have been so much better but they kept it way to small with the posable options. Now I think most gamers will get bored and put the game away and never look at it again.
"Over 200 player cards including 12 never before seen" They forget to mention that most cards do the same basic thing (about 95%). And that is to give your bakugan more power. The main difference is that some cards need / give a better bonus to a specific attribute (fire, water, wind, earth, light and darkness) and other cards cards give needs / give a better bonus to specific bakugan.
"More than 250 unlockables" These are just the bakugan and cards that you can buy.
The story is way to short, and there isn't much of a story anyway. If you just do the story then can be done quickly, 3-5 hours assuming you win every game. But if you really do everything (unlock all 250 items) you will need about 10-12 hours.
There is also a park where you can battle with the players that you already beaten, and a challenge post. Nearly every challenge is beat every on every level, (easy, medium, hard and for some hard again with evolved bakugan), this way you unlock other bakugan and cards in the shop. The other challenge are, get to the first place on the ranking system, get every card, get every bakugan and all 3 things combined)
The bakugan battles start with using ability cards and the battle itself is done with 1 of the 3 minigames. Shoot your bakugan symbol, timing (press the a, b or shake the remote on the right time) and rapid shaking. Also very boring after your 30th battle or so. There are 3 levels for the minigame but its all basicly the same.
To summerize. Its a game that had potential but because it gets boring (same type of cards and same battle minigames over and over and same challenges) I think its entertaining for a few hours but then it get to boring for most people. Shame it isn't more like the tv show, could have been a lot more entertaining.