The best Halo in the series, an amazing throwback to the first and very innovative. One word summery Perfection!
Single player campaign: I cannot even begin to describe how amazing this story is. You find yourself attached to every character and while I haven't beaten it yet I understand the outcome and am deeply saddened already. The enemies are ferocious much like the original game and I no longer feel that the covenant are silly. The elites legitamatly frighten me again something that has long since past after Halo CE.
Multiplayer: As one that never got into the multiplayer of the first three titles I must say the online adversarial modes in this game are amazing. While I played with my buddies in Halo CE and Halo 2 at LAN parties this is the first to make me want to get a bunch of people together and get multiple Xbox 360s TVs and copies of Reach to do this again. Since Halo 3 the effort hasn't really been worth it but I feel that now it will be.
Firefight: Great concept in Halo 3 ODST but they really pulled it off in this one. The armor abilities, assassinations, and ordanence drops go a long way to help balance out the Covenant hoards.
I will have more to come but I'm getting a little tired of editing so for now I will post this and continue the review at another time.