Great, but at the end of the day we know Wii U is going to be generally on par with current gen systems in regards to performance.
If WiiU is "on par" with PS3/360 then Xbox 1 is "on par" with the Dreamcast. WiiU is definitely a more powerful system than those two platforms. I believe the WiiU's superior abilities will be easily proven when developers are able to port over their PS4/720 games that cannot be done on PS3 or 360 due to memory constraints and feature limitations.
You can judge the WiiU's overall power by its launch line-up all you want though. I'm definitely not going to stop you. When the time comes, we will see a noticeable difference over what current gen platforms can display visually.
Just don't expect the difference in Sony and MS's next-gen platforms to be anything like the leap we acquired from the PS2 to the PS3. The biggest visual difference, besides the new features available with OpGL4+ and DX11, is going to be that the new consoles will finally be able to do a lot of the things, in real time, that the PS3/360 had to constantly "fake" in order to achieve a playable framerate; one of the most important being, no more "fake HD" upscaled to 720p.
The truth is that the two platforms, which we dubbed the "HD twins", were never truly capable of running complex games in native HD resolutions. Constant corners had to be cut in order to render in 720p at a reasonable framerate, especially for more complex games that displayed a lot of real time physics, and large realistic environments.
Most of the 3rd parties console development tools are built around taking the most advantage of very incapable hardware. It's going to take time for them to design console development tools around hardware that is finally capable of properly producing HD resolutions, without having to make tremendous visual sacrifices.
The games will look better for sure, but not anywhere near "Avatar" better. The PC version of Watch Dogs is a great example of what to expect, on average, from next-gen. I am certain that the WiiU would be able to run Watch Dogs closer to the PC builds than the PS3/360 builds.
Lastly, retail HD game development budgets are already out of control, requiring sales of 2-4 million copies just to break even. In response to this, I expect publishers to play next-gen much wiser than they did this generation. The best selling non-Nintendo game series ran between 544p and 608p at 60fps, and was not even close to being one of the best looking games of the generation. I believe that sent a message to publishers as to what gamers care more about.