What did you expect?
GAMEPLAY:
As usual halo has a amazing storyline that you will just want to finish once you have started it. you can play it solo or co-op and over live with 3 others and yourself (which is a great help on ledgendary). Also there are multiple extras to find, skulls, terminals and some secrets)
Multiplayer is also amazing and may be like halo 2's but you still want to play it.
Added into the game is a forge mode in which you can place all kind of different items into a map to create your own map variant for custom games. And theater mode records and temporarily saves a recording of your last few matches so you can save the whole thing or just record a short clip.
GRAPHICS:
A improvement on the last games and looks pretty nice. There is alot of detail put into the game. But the vehicles look great and so do all of the character models.
SOUND:
Halo sounds great, all the sounds fit their purpose and there is quite alot of voices for marines (including a pretty annoying one that sounds like a grunt). All the guns sound like they sound and so do the vehicles.
OVERALL:
Halo 3 is a great end to the Series and you can play the multiplayer for a while after you have completed the campaign. alouth it get's sorta boring after a while it is still good.
PS- WATCH THE CREDITS