I'm rating this in terms of sheer fun. I believe CoD2 is the most balanced game. However, I absolutely loved BO. BO2 will probably go after WaW. I only got to ~ lvl62 in MW3 but I really, really hate MW2 (despite the amount of fun I had, it's a terrible game). CoD2 would be higher if people still played it and if I had friends who played it.