I'd have a hard time imagining any professional programmer wouldn't think to gobble up a few extra GPU cycles to pad CPU inefficiencies, even on a quick port.
Fact is, there is only so much you can shove off to the GPU. CPU intensive processes can't universally be handed off to the GPU in a 1:1 ratio. The failings of some ports, most notably Batman: Arkham City, is likely due to how CPU dependent the game engine is.
What this all really boils down to: unless 3rd parties go above and beyond even a 360>PS3 port for Wii U releases the multi-plat titles started on 360 will suffer on Wii U at least comparably badly as the PS3. Generally won't be deal breakers, but you aren't getting the latest and greatest version of ports with the Wii U.
It also clearly outlines that the delusion of PS4/Xbox 3 games can and will be ported to the Wii U should just stop. It isn't going to happen. It will be very similar to the Wii v. PS3/360/PC "ports" of watered down, different engine releases.
The real selling point of the Wii U - Nintendo first party releases and select 3rd party exclusives - will continue to be the same elite software offerings we've come to expect. I'd bet that Bayo2 will blow anything from the PS3/360 generation out of the water. Devs who commit to building their game around the WiiU's architecture will have a very strong environment to work in relative to the PS3/360 era.
But then this isn't really news, just confirmation of what we could see developing for the vast majority of the Wii U's pre-release period. It is another iteration in the Nintendo walled garden hardware series, and it will likely work out quite well for Nintendo specifically. It is a hardcore Nintendo fan's first purchase, the 'family friendly' alternative for casuals, and the first "2nd system" most gamers will be tempted to buy. That strategy did just fine for the Wii. Hardware limitations won't hamper the Wii U's marketability. The appeal of tablet, the higher MSRP than the Wii, and what the early software lineup offers will determine it's future.