The return of Master Chief will have Halo competing with the big boys once again, says Microsoft

[Reasonable]

I think he's right about MC being core to the experience, ODST and Reach I felt definately struggled for a central focus and both I would argue were weaker franchise instalments in terms of SP.

But biggest platform exclusive? Mario/Nintendo core titles surely take that position. I know it's PR speak. But by most criteria you could apply it's inaccurate.