Hey, I decided to do a review on Halo 3, which will cover the online and campaign parts of the game, so I shall start with the part that (I hope) most people start with, which is campaign.
CAMPAIGN/STORY MODE
I thought that this was probably one of the best story plots for a FPS game, it had great graphics, a long story that keeps you interested throughout the whole thing, and just the perfect difficulty to make gamers want to stick through the whole thing. It has just enough twists in the story that make sure you wont expect anything to happen next, which is perfect in any type of video game, especially FPS games where you do nothing but go around shooting things, in this case aliens, which is another plus to the game, being you won't have the guilty feeling of acting like a psycho or whatever for wanting to kill an actual human, virtual or not. For those who have not played it yet, I won't reveal much, but what I will tell is that you start off as master chief, and your goal is to rescue cortana, and to stop the Prophet Of Truth. But that turns into a bit of a side goal once the virulent flood spreads, making them seem zombie like, and can't change back to their normal form. For any person who likes good story plots and great FPS games, I suggest getting this one.

ONLINE MODE
The online in this game is pretty much the same as every other game, you join a lobby with a bunch of people and go shoot each other till you get the most kills, and eventually level up. You get to drive vehicles, pick up multiple guns, and have good graphics. Nothing much to explain here. It dies, however, have new maps that are quite good to navigate through and such, some of which are helpful when trying to hide to kill or recover your health. I'd recommend this to whoever likes playing online though, being it's te same as every other.
So with that said, I give this game a rating of 9 out of 10.

This game is definately pretty cool, I like it, not everything is my favorite but the game overall I like too. Good game.