so i bought l4d2 today and everytime i try to play a game its lagging ridiculously bad. the people that were in the games with me said its been the same for them. so what i want to know is if anyone has any info as to why this is happening and/or if valve is fixing this major problem. i am playing on 360. (im not looking for pc users saying xbox sucks so if thats what you are going to type dont bother)