Epic. Sets the bar for future FPS 360 titles.
The amount of control you have over your powers and customizing your attributes and weapons rivals most roleplaying games while still staying very true to the FPS format. You can walk into a room with a few enemies and deal with them in a number of ways. The possibilities are endless. Water amplifies an electric current, gas and oil catch fire, ice melts, very interactive. You can even hack security systems and most vending machines.
Bottom line: I'm not as excited for Halo 3 as I was a week ago, thats saying alot. This game could very well be the best FPS I've played to date (Doom III holding the rank prior). This game delivers on all fronts. If you like good games, this is a must have. I hope developers take a good long look at this game because this is what gaming is. 10/10