Pretty good, but has a few flaws.
Story Mode:
You play as one of two characters and fight to defend planet Zi. I haven't gotten that far into the story, so that's pretty much all i know :P The story is quite difficult though, You fight so many zoids at once, it can be kind of frustrating.
Tournament Mode:
This is probably what will keep you busy most of the time. You choose your character, and fight in matches to earn money to customize your zoid. There's at least one hundred zoids to choose from, and they all look great! You can even unlock others by completing Story Mode.
Versus:
Self explanatory, you and your zoid go up against a friend. This mode is pretty laggy when there's two players though, sort of annoying.
Flaws:
Well, here's the part i hate to do. But this game has just a few to many... Okay, so the zoids are greatly detailed, but the environments... not so much. There all very block-y, and indestructible. No matter how many shot you fire at a building, nothing happens. Then there's the AI, both enemy and Ally. The enemy is okay, but your ally is just plain stupid. In this game your able to give your ally orders to follow, but they always just do there own thing, and end up dieing.
This is a good game, but id recommend something like Zoids Full Metal Crash, over this.