Where is the other 3 maps in matchmaking???

In Halo 4 most of the maps are unbalanced and unfair. (Not talking bout DLC maps there great) But wanna know why Ravine, Impact and Erosion are not part of matchmaking… most of my buddies and i love ravine and Impact its even and fair no matter what base you spawn at and maps are not to small and not to big either. Who would like to see these 3 maps added in to matchmaking?

Forge Lighting Problems possibly?

I dont know Impact and Erosion look like a lot of fun