Being able to join random custom games is something that should have been done after Halo 2. It doesn't matter if the game you join is riddled with fools, simply back out and try again. If that's too much trouble just host your own for others to join. It would be nice to have something like this if we wanted to take a break from the competitive side of multiplayer. Forge and Custom Game Matchmaking is a really good idea and I'm sure many others agree.