Well, the important question is, does the demo run well?
If it doesn't hog CPU cycles, that's not inherently a bad thing. In fact, if it runs well and doesn't overly tax the CPU, that's a *good* thing.
This is not a ground up nicely built game ala Crysis.
This is a rehash of an xbox game they've decided was an easy port over for PC in time to claim to be the first Direct x10 title on the market.