A friend and I were talking about this yesterday, and he feels that Reach is the best Halo package while Halo 4 is garbage. I don't agree personally, I played more of 4. I think that both Reach and 4 were great games, just not great Halo games. They introduced too much randomization into encounters with the armor abilities for the game to be focused on skilled play. The addition of more randomization in Halo 4 drive the game further from the base Halo formula which made most battles impossible for good players to reliably predict. Reach was similar though, with the jet pack, armor lock, camo, decoy, sprint abilities the game was a mess of potential imbalance depending solely on what each team chose as armor abilities. I feel that Halo began the decline into randomization with Halo 3 with armor abilities that were pickups throughout the maps, but it was too bad due to the ability to reasonably predict who had picked it up due to timing and map placement. Halo 2, assuming no physics or button glitches, was the most balanced Halo gameplay wise. This is just my opinion, and they are like assholes, so ignore me if you think I'm an idiot because in all likelihood I am.