So the Wii U's CPU, for launch titles, is roughly as powerful as that of the 360 and PS3 at the end of the generation. Given that they have yet to learn the optimisation tricks available to make it run faster, I'd say this is proof that the Wii U's CPU is stronger than the 360 and PS3 CPUs, albeit not dramatically stronger. And I wouldn't be at all surprised if optimisations for the 360 and PS3 actually slow it down on the Wii U, because on 360 and PS3, they're working to bypass bottlenecks that aren't there on the Wii U.
Nintendo has always taken the approach of "reduce the bottlenecks" rather than "brute force it". That's also why you can get a game with graphics and physics like Super Mario Galaxy out of the Wii within a year of launch.
As rubido above me pointed out, there are things that are done with the CPU on 360 and PS3 that can likely be handled by the GPU, or by other units, on the Wii U. But it will take time for developers to adapt to those abilities - expect use of them in the second generation of Wii U titles, releasing late 2013, once they've had a chance to get used to it all. And expect Nintendo themselves to be using them even earlier.







