Cool game!
The good: Online play is excellent; it is an outstanding shooter; amazing graphics; loads of cool features and tons of multiplayer modes; excellent character customization in verses; you can now play as "The Arbiter" in campaign, but only at certain times; you can now play as an "Elite" in verses
The Bad: The story is very hard to follow; You can beat campaign within a couple of hours; no AI bots; once again in coop you play as Master Chief duplicates
If you liked the first game, or even if you've never played it, chances are you'll enjoy this game!