Actually not really. Most maps (Narrows, Snowbound, Pit, etc) have unfair advandages if you gain certain weapons. I know its part of the game, but at least in Halo 2 you could defeat them once and a while. In Halo 3, its unlikely that it ever happens (ie. Maulers on Construct).

MLG has been trying to set up for the future season by altering the maps. They have changed the settingsso that unbalanced maps are now fair maps (by limiting the amount of shotguns, rockets and maulers on the maps.) They have also increased damage counters and decreased shield regeneration so that the game is faster.

MLG is now a playlist under community if you want to try it out. Ill be honest, thats all i have been playing now and Halo 3 is just as fun as Halo 2 now;