Weapons are supposed to be balanced and if you build your maps around power weapons, you need the power weapons balanced as well. Screw the increased map size and jet packs stuff, but the weapons needed to be balanced. In the first Halo game you started out with the best gun, human pistol... it was a straight up pure FPS MP game because of that fact.
In MLG settings you started out with the BR which was the h2 equivalent of the ce pistol. So that point is moot. Further adding to the conclusion you were a casual player and didn't even experience the game like me and dex did because of that fact.