I prefer Combat Arms because it is free. The player doesn't have to be using a gaming computer to play and enjoy the game. There are different channels to play on, so the brand new RCT won't play against an MSG2. In MW3, many brand new players will want to quit from all the high levels with their more powerful guns and perks, and even some cheap moves that experienced players will sometimes use to get all the kills they can. Also, Combat Arms has the most guns out of any other shooter ever made. Hackers can be kicked out of games in Combat Arms. People can spend money on NX to get powerful guns, but you DON'T have to play with them, and if you really want you can kick them. Anyway, those who do choose to buy NX cash are giving Nexon money, which lets them make the game better.