Bakugan: Defenders of the Core sounded like a good game to me. It isn't. I'm not even sure where to begin on this one...
-The plot of this game seems like it was written by someone who has never read a book, seen a movie, or played a video game before. It jumps around between settings and characters in a barely intelligible way without developing anything or anyone. The only reason I can follow such a poorly told story is that it is so painfully simple that there's just nothing really to follow.
-The game's dialogue seems like it was written by a six year old. It reminds me of a poorly written Saturday morning cartoon where they treat the viewer like an idiot who can't follow anything unless the characters just say explicitly what's happening and what they're thinking at every moment.
-The bread and butter of this game is the battles. They are done along the lines of GameCube's old title Custom Robo, or if you prefer, essentially like a fighting game. The battles are good looking, and the game makers attempted to give the battles some complexity so that they'd require some strategy (you have to protect some objects, destroy others, and deal with multiple enemies at once), but they totally failed. Instead the battles are a button-mashing mess with a poor system of managing targets and camera angles. This isn't even the good kind of button mashing where you can take out some aggression. This is the kind where you just tap 2 or 3 buttons a lot while you stand next to the enemy and hope some sensible happens. It usually doesn't.
-Between battles, there are stealth adventure style missions in the tradition of Beyond Good and Evil. You must avoid being seen by enemy guards. This too is very poorly done. The missions are extremely boring and tedious.
The best thing I can say about this game is that it's plays smoothly. I might recommend it for an 8 year old who can't follow stories and has limited motor skills. That's about it.