I bought this back a while ago when it was on sale for $15. I know I could of had 3 copies already -_- For $5 dollars it is a steal and basically is almost free. The Co Op If you have friends is great and so is the Multi Player dog fights. Like I said if you have friends it's fun. If not good luck finding people to play with you. The Multi and Co Op have a ranking system similar to Modern Warfare that unlocks more weapons, planes, ranks, ect. The Single Player is pretty short. Like 6-8 hours of game play short. Overall like I said it is a steal so if you want add me as a friend and we can play.