Activision secretly experimented on 50% of Call of Duty players by 'decreasing' skill-based matchmaking, and determined players like SBMM even if they don't know it
If you ever find yourself in the middle of an argument about Call of Duty and want to toss a tank of gasoline on the fire, recite these four letters in order: S-B-M-M. Skill-based matchmaking is the invisible system by which Call of Duty, as well as most modern multiplayer games, match you with similarly-skilled players so that every matchup is as fair as possible.