I bought this today. It was either this or Tetris (which I'm sick to death of).
I thought it was really slow paced, at first. But the first robot battle literally had me floored. The explosions feel almost atomic, they're so massive.
This is one of those games I'd probably dislike, had it been the price of a normal 360 game. The budget price is a plus. But is it me, or does this really feel like a Dreamcast game? (I mean that as a compliment)