Another thread of fanboy crap with no connection with the real world.
The wii u is in the same area of performance as ps3/360 and they have as much claim to being next gen as wii u does.
Again for people stupid enough to read these threads and actually believe them you need to look elsewhere like eurogamer faceoffs, lens of truth etc and comparison reviews in general.
As for the comment about the gamecube vs ps2 again you can't just say the gamecube is superior full stop. Each format has advantages and disadvantages. PS2 has 5.1 sound not 2 channel sound, it has 32bit colour not 24bit to enable some good transparency effects, bloom lighting etc, it has full size dvds not mini-dvds. Games like Gran Turismo on ps2 are 1080i. Clearly the Gamecube has other huge advantages over ps2 like a massive more powerful cpu and more powerful gpu in most areas. Certain games will have advantages on different hardware depending on what resources they need.
It is so sad to see the denial of reality in this forum. You are so out of sync with real world views of the wii u techically that you see on multiformat forums.
The answer to the question posed by this thread is that the few PS4 or xbox one games that get downported to 360, PS3 or wii u will be very similar across 360, PS3 and wii u with a greater chance that they will perform a little bit better on 360 and PS3. As has been the situation so far. The only real chance of the wii u version performing between 360/PS3 and PS4/Xbone is if its a game that has lower cpu requirements but relies on more memory being available.
I hope when Watchdogs comes out and we see how the wii u performs (very close or below 360/PS3) we can stop half the unicorn tongue on these threads.