Halo 2, they added dual-wielding for smaller weapons, no sprinting, unlockables, easy ranking system. Halo 3, they took away dual-wielding and added special stuff (can't think of the name right now) still no unlockables, easy ranking system and sprinting. Halo Reach, they took away the special stuff and added sprint, cloaking etc etc and easy ranking system. Halo 4, well you see for yourself. Everything started to get ****** up in Reach. When Bungie did it, it was minor compared to this and it was better. Maybe i've should've said ''not alter it this way''.