Something I've never been able to figure out from Halo 3 and can't tell from this article: I paid for the Halo 3 DLC but 99% of the games I played never ever used the DLC maps. It was next to impossible to ever play on them; I'd be suck playing on the default maps because anyone that I was matched up against didn't have them.

Is there any way to say "I will ONLY play on x DLC?"