I saw this in another thread and thought it should go here too. Ferrex is MP design lead for Bungie and also works on playlists. He answered some questions in the Optimatch forum so this is a C&P from one of his posts there. [quote]Posted by:[b]ferrex[/b] First, there is a general matchmaking issue affecting parties of mixed skill levels, which slows (or halts) the progress of players in those parties. This is made worse in large teams, and doubly so in Social playlists were skill levels are not displayed. Top men at Bungie are investigating the cause for this issue (tentatively identified as an unintentionally vigorous guard against boosting exploits that were a problem in Halo 2) and effective fixes for it. All of our playlists will benefit from dialing this in, as soon as we feel good about the changes.[/quote]