Are still wondering why you started defending Mantle being optimized for CPU bound rather than GPU bound usage scenarios, then start bawling about an Nvidia driver (since you're an AMD board user I find hilarious) being shown in the same light.
Why do you expect an Nvidia driver to have wholesale improvements and live up to PR hype when Mantle is in the same boat?....in fact you seem hell bent on defending the latter.
BTW:
Here are some benchmarks that are more CPU limited (Hitman and Crysis 3) versus some that aren't.
For me, if there is ANY performance or game quality gains to be had and a driver does not break compatibility with anything else I use, I'll use it.
You? Well, you should continue to not use an Nvidia driver with your not-Nvidia card.