Co-op play is virually impossible. We actually have two X-Boxes in the house and usually play other XBox games with gamelink. For whatever stupid reason this game doesnt support gamelink and requires using EA's servers, which we get disconnected to on a regular basis when trying to play. Our network connection is stable and fast - we never have any issues with any other game or anything else.
Believe it or not, that is not the worst issue, the game freezes in the space sequence at the beginning of Chapter 2 flying through the mine and dibris field every time and results in one or the other XBoxes freezing up completely with the only solution to turn off the box that crashed. When it freezes, the controller of the box that froze begins vibrating until the box is power cycled.
This game BLOWS and is unplayable.