Xp glitch on alien vs predator

Yes there is... First search for a ranked match in Multiplayer mode. When it says "One player in game, waiting for more players", quit, and go to the main menu. Then, load a Marine mission on the Normal difficulty with a lot of enemies, such as the Praetorian boss in the "Research Lab" mission. Simply kill enemies now to get easy XP. Repeat this as many times as desired