A wondeful gaem, although I never liked Halo, this has made me a lover of Halo.
And run you will; the single player campaign can be a compelling, even though it is the weakest link in Halo3, but it is still a story worth enjoying. Halo 2's ending was met with a lot of criticism due to its abrupt and anticlimactic nature; with Halo 3 its sort of like replaying Halo2 to experience it all with none of the disappointment. Don't think you're getting a 20 hour single run-through though; you're still looking at a shorter storyline and an ending that isn't terrible, but it isn't nearly as exciting as it could have been. Halo3's multiplayer components are by far the strongest parts of the game, and even if you're sitting on a couch beside your friends or playing through the wire, it holds a pedigree in balance and control that few games can touch.