Your conclusions are only true if the Wii U has a comparable architecture. It doesn't. The HD twins greatly leverage the CPU, whereas the Wii U will move a lot of the CPU based tasks over to the GPGPU (as will the Durango and Orbis). This is why the Metro dev said their game would not be coming to the Wii U, as the engine for the game was made for this gen; The weak CPU would not be a good fit for their game as it is very CPU intensive. Fair enough. So, it is true that the Wii U has a "weak" CPU, but this is for a reason, not just because Nintendo is "cheap", as some want to use as a proof of why the CPU is weak.
The people claiming that, "The Wii U is just an Xbox360.5", continually fail to grasp that the Wii U ports of AC3, BO2, etc., are all built for a 360 / PS3 type architecture (the Cell is a good correlating example of why 360 ports for the PS3 have always sucked). Wait for fall of 2013 when the next gen system wars heat up between the big three. Then we will have our new engines for the new architectures to pass judgment and do our comparisons.
The conclusions that you have made above are way too premature, to say the least.