There is no universal scale of gaming power, any claims of 2X, 6X or any X are really quite silly. But we all like to do it. Does having 4X the RAM mean a system is 4X more powerful? Is a system only as strong as it's weakest link? It's all quite arbitrary. I can say from my experience with PC gaming that when I quadrupal the RAM, the difference in game quality was dramatic. When I upgraded a card to a newer model (even when I just replaced a card one year later when the first died), I noticed a significant upgrade in game smoothness. I've seldom noticed a big improvement from improving the CPU. Console gaming is a whole other beast, but I think the RAM and GPU improvements on my WiiU vs. my XBox should be noticible when utalized. And I think WiiU should be able to handle, with little sacrifice, at least the early NextBox and PS4 games. If engines are scaled even moreso, with just extra graphic detail lost.

Agreed, besides the Wii U is most likely using a Northern Island based GPU design that would still be able to handle or keep up with the rumored Southern Island design found in both the PS-O or Xbox8.  There is of course the chance that MS will use the Sea Island design in which case the e6760 used on the Wii U would be a few gens behind the X8 but probably within range of the PS-O based Sth Is.

in terms of DBZ it's gonna be

Wii U:

PS-O:

Xbox8:

In my opinion, slightly more powerful than PS3360.

oh I forgot the PS360 would be: