I know this has been suggested before, but sometimes there are not enough guildmates to form a LD team, and sometimes your best friends are not in the same guild that you are in. If we could have rooms with limits of 4 and 7 then Lockdown matches would be much more colorful for some of us who want to fight alongsides our friends who are not necessarily in the same gulid.
+1 if it's unranked. Otherwise, too much potential for cheating your way up the arbitrary leaderboards.