Awesome story, especially if you followed it from Halo: Combat Evolved and read the books.
The story can't be disputed, the Halo universe is huge. The graphics, yeah they could have been better (I say that because there are certain maps and instances where the graphics will screw up, can't be avoided but for an advanced game such as this it should) but I can't complain too much since the old standard for graphics was Halo 2 (baaaaaad graphics there).
The soundtrack and mixing was done to a T, it never took anything away from the gameplay or distracted the player at any point, and perhaps most importantly it never gave anything away. What I mean by that is take Gears of War for example, as soon as all the guys in the area are dead a horn or something sounds and you know you can move on. It was too arcade-y for me, and I liked getting ambushed by tricksy Brutes and Elites, and ambushing stupid sleeping Grunts.
Fun and replay value go hand in hand here, if you had fun playing the game at all you would replay it over and over.
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