1) Innovation =/= originality. Might as well say Casablanca's skullskullskullskull because it ripped off the first film with a narrative.
2) HL is a PC game, and we've already established our rationale for why this is special for consoles.

What Halo 3 did was never done before and has changed videogames, at least on consoles, more than any of the other games have changed anything. Is innovative necessarily the EXACT perfect word to use? Maybe not. As Azar said, we're not going to think games are lacking if they're not Portal. And we're not going to think games are lacking if they don't have Euphoria to the same extent that bad matchmaking etc. will be inexcusable. In fact many's a time I've lamented the absence of theater in GTA. I've not lamented the absence of anything about GTA in Halo, really. And yeah, Wii Fit, I'm pretty sure the day will never come when I lament anything about that gimmick except it's popularity.