there's a frankenreview up on kotaku. I played it a little and not only is it super cool and fun, but it's an amazing looking and playing DS game. One of the more technically impressive games on the system. Bovine thinks you should try it out.
The Kotaku editor review sold me today. I was going to wait and pick it up in a little bit, but I just couldn't. I've only done a couple of missions, but it's really fun so far.