I purchased the game when it came out. Installed all the codes and they were working fine all armor's including 300 armor are present. As far as the multiplier I noticed that the first two days I would get over 3,000xp for every match won. I installed the game at 6:00pm. Came home yesterday and found that after I won a match my experience would be around 1,500xp.
What XP is everyone getting on average after completing the match?