I somewhat disagree (not saying you're wrong). See, I don't think Halo was groundbreaking at all. I just think it was incredibly refined. Everything it did, it did well. The gameplay, while some may have not cared for it, was flawlessly executed. The graphics were top-notch, the settings, levels, and story were all great. The music was fantastic (probably the best I've ever heard in a game) and set the tone perfectly. Also, no bugs/glitches/collision problems whatsover. I just see it as the template for what a good game should be.