This game is tougher than MW2 to really stay alive longer than 2-3 kills. The re spawn is much more aggressive and keep you looking over your shoulder, almost no place to park that doesn't give you at least 2 lines of sight most of the time its 3, which makes camping less successful. No stopping power and guns are all within a tighter range of damage so most gunfights come down to being calm and aiming very well. None of the kill streaks stack, so you can't get one and use it to get three kills and open another kill streak! That alone as taken away the easy button in the multi-player. You can survive a hit and duck a corner causing some very quick thinking, strategy based shootouts that never existed in MW2. And finally the best one, NO HEART RATE MONITOR! I actually get scared coming around each corner.

The difference is very obvious and will turn off some MW2 players, but in the long run, I believe most people will enjoy this challenge for a much longer time with less frustration.