I am half way through the campaign (co-op with my son). I also played about a dozen online multiplayer matches.
I love it, it’s Halo 2, just better, much better, and that is exactly what I wanted. They did not mess with the fundamentals of the game, they just improved the graphics, finished the story, and added a lot of new cool toys for multiplayer (equipment/vehicles/weapons/accessories).
The graphic textures are crisp clear on 1920x1080p and way better than Halo 2, they are not ultra realistic like Gears of War or BioShock, but they are good graphics, eye candy in every sense.
My only qualm is why is it rated M? I want my 12-year old son to play it with me, and my wife is making me feel guilty about it due to the M rating. The game actually does not have any gruesome violence (ala Gears of War chain-saw action), just artistic blood splatter ala the movie 300, but without any limbs being cut off. Anyway, I think it is ok for pre-teens to play it, and trust me, they will.
My son enjoyed “The Forge” a lot, it is like his virtual playground where he can make explosive physics experiments or drop tanks on top of his friends, a very welcome addition.
The mobile bases on the Sandtrap map are hilarious and really change the game dynamics..
The game is also revolutionary in being Web 2.0 like, that is you can easily share screenshots and video clips with your friends. The replay theater is super cool, lets you replay the action from any angle and pause/slowmo to learn tricks from other folks you were playing with.
That’s all I can say for now, need to wrap up some work so that I can run back home to finish the fight 🙂