xp dont have an effect. it might seem it but its not. if u start a new account with 9000 xp but have not played any games in a type of playlist. lets say team snipers. if u win the first game u will go up about 3 or 4 lvls. after that if u win agen u wil probs go up agen 3 or 4 lvls. this will keep happening until you lose agame. this is becouse the computer has not found the lvl where u will start losing at and start finding it hard.