The best of the halo games,and my favorite shooter since it came out.
Another main change is the new armor powers of which you carry one at a time,these are more or less the same stuff like the bubble shield but they are reusable.
The story is focused on the covenant invasion of reach right before the events of halo CE and follows the story of a team of six spartans as they defend their homeworld.You play as the newest member of the team who is a silent character but he does deliver some memorable lines at points in the game.
The story does a good job of building the despair of losing war and you will feel admiration for the spartens refusal to let reach die without a fight.
The firefight mode has been given more control options,even allowing you to choose what you fight at each wave.
The multiplayer is more or less the same but the new class system and the new weapons add new aspects to it.
Overall i would recommend anyone who is a fan of halo or shooters in general to check out this fantastic game.