It's never a simple comparison because different consoles can be stronger in different areas. wii u has inferior cpu performance to 360 and ps3 by a long way plus has less gflops in theory for the gpu. It also has memory bandwidth issues and has no hard drive to stream in data quickly but it does have later gpu architecture, a 32MB of fast memory for the gpu and 1GB of game memory instead of 512MB of the ps3 and 360. You give it a game that requires decent cpu performance and the wii u struggles but you can write a game for its new gpu feature set not available on ps3 or 360 and it can look better. You can only really do an average based on the games available. I have 360, ps3 and wii u and I'd say the wii u is the weakest but that doesn't mean at times it doesn't have better games sometimes that play to the strengths of the hardware. I'd personally put them on a similar performance level. I guess my favourite is the ps3 of the three consoles with the 360 close behind. Still love the wii u though and enjoying Zelda immensely not that I'm that great at it.
