Everybody has there favorite Halo game for MM. Some like H2, some like H3, and some like Reach the best. With all the tweeks that can be done with game types in customs, couldn't 343 make a slayer playlist for each Halo game within Reach, with recreated forge maps for that game to put in the playlist?
I know they would never do it, but isn't it possible?
Reach still has the best custom game options of any Halo game to date.