A very solid game considering it's a free download.
That beeing said I highly recommend you play this game with at least two other people because if not it becomes punishingly hard and you will get frustrated.
Besides that the controls are very tight and it is oth fun to shoot everything on screen and to try to dodge enemy fire. You can also link up with other members of your game which makes your attacks much more powerful but hurts your speed and mobility.
You should definetly check this one out especially because it's free and you have nothing to lose at all for downloading it and firing it up on your xbox.