In all the above-mentioned modes you can tweak and customize gameplay to suit your fancy, so if melee combat is your party’s thing, replace all weapons on the map with energy swords or gravity hammers. Like big explosions? Replace weapons with rocket launchers.
By granting players such control over various facets of gameplay, Bungie has made sure that players find innovative ways to keep themselves occupied.
Oh, and I almost forgot, Bungie has included a nifty little customization feature this time round that allows players to doll up their online characters any which way they seem fit. The only problem with this is there are hardly any customization options to fiddle around with and unlocking most of the cool stuff takes a lot of time and experience.
Matchmaking
So you’ve heard all about Bungie’s revamped Matchmaking feature and yes, it is pretty awesome. But just how feasible is it? Well, it works most of the time but it can sometimes be a bit of a bitch, especially if you’re living in India and have a moderate NAT.
Matchmaking in Halo 3 is basically Bungie’s way of making sure that people with similar skill levels can play with each other so you don’t have to worry about getting your ass pounded by veteran players.
How does this work? Well, every time you (or your team) wins a match, you’re rewarded an experience point and Matchmaking makes sure that you take on players who have more or less the same experience level as you.
Besides skill, the game even allows you to further edit your matchmaking options using parameters like language and connection. If ranked matches aren’t your thing (or if your party consists of more than four players) you can head to the Social Playlists. But be warned, finding a good server in Social Matchmaking can take a bit of time.
The Halo 3 multiplayer on live is one of the greatest games ever. 
