Halo reach by a LANDSLIDE. The campaign was shockingly good, and the tagline "from The beginning, you know the end" just tells ya everything. It makes ya dread the ending, as the terror of the covenant army and their seemlingly limitless troops overwhelm you, and the people around you die like flies. And then the multiplayer for some reason really convinced me it was great. I will say that that armor shield thing was a huge piece of crap that just completely put a stop to the smooth flow of messy, plasma filled warfare. I suppose halo 3 would be a close second. And then halo odst after that.