There is a serious issue with the Xbox Live experience. There are players online who follow other players and use software through their PC to kick other players out of games, or go as far as causing Denial of Service Attacks, which totally disables the other players internet. Not just from the Xbox, but from their PC as well. Reporting these players via the console has done nothing, using the options to Avoid these players does nothing. Posting on the forums was the only answer Xbox Live Customer Support could provide for me. Let's see if it helps.