Halo 2 is a great game. It features 12 (i think) diffrent weapons for Master Cheif to use. The Campaign is fun until you beat it a few times through and their multiplayer is great given you have the friends to play with. But even if you have three friends to play with it is dull without X-Box live because there is always the temptation to look at the other person's screen to know what he is doing. X-Box live doesnt let you do that and it forces you to go on what you know, not what you see. It also lets you create multiple styles of multiplayer, custom games are great most times. So playing with 8 people on each team, CTF is awesome with something like no shields and/or active camo on always. One common game is Swat. Give the players a Battle Rifle and a Magnum as starting weapons, take off shields and go to Foundation. It's a load of fun and requires great aim because you have to shoot eachother in the head to kill in one hit. Anouther really cool feature is that you can make your own kind of Elite or Master Cheif. But in my opinion there should be more logos to put on your shoulders, not that enemies look at your shoulders before firing.
There is much I did not cover about this great game, but from just this I give this game an A-