Control stinks
Graphics are good for an XBLA game. The level design is fine. But the controls are very bad. When you press jump many times it will delay (or not resondcausing many many falls to your death. You will also constantly be over running your intended location.
Long story short. If the controles were better and the game was 400 MS Points I would say this is a game to get, but as it is.... 800 Points ($10) and less than reponsive control makes this a don't buy in my book. Spend and extra $5 and get Quake. It has its own problems, but it is fun and lasts more than an hour.