I say let's add Join in Progress to Halo MCC Social Matchmaking or at the very least to Big Team Battle, especially since this is standard in Halo 4 on the 360. Why you may ask? Well Big Team on Halo MCC is traditionally a long wait in my experience and I think there needs to be a way to start a game 6V6 or even 7V7 and find the other teammates as long as the game hasn't exceeded the halfway point so to say. This would be a game changer and maybe would create buzz and excitement of Halo 4's best game mode now being just as electric for Halo 2 and 3 maps, and encourage players to try it. Once players quit out of a Big Team game it ends up becoming very one sided and boring which creates the illusion that Big Team simply isn't as fun as 4V4 or FFA. Yes it will take work on 343's end to create new code and server commands but this could lead to big and new changes. Please 343 lets make this idea a reality!
Let's add Join in Progress to Social Matchmaking