Well, I'm very happy with my WiiU but I don't believe in those "magic solutions" until I see them. I mean, eDram hasn't been confirmed at all, we don't even know if it really exists, and even if it did, Xbox 360 also had it.
Now if in the future I see some games that demonstrate me that the WiiU is as capable as the Xbox 360 or the PS3 or even better, then great for me, but at this moment, what we have is:
A CPU that basically is 3 Broadways at 70% higher clocks and instead of sram cachés, eDram ones that will of course be less effective latency wise. In comparison, it has a little more cache memory than the Broadway (same L1 (which probably is still sram memory) and double L2 on two cores, and the remaining one with 8 times L2 cache size) but even assuming this improves overall performance in a clock per clock comparison, it's nowhere close to the Xbox 360 CPU in terms of GFLOPs.
14 maximum peack GFlops for WiiU CPU against more than 100 GFlops for Xbox 360's Xenon (it's CPU).
About the GPU, we don't know anything. It will probably be more modern than the one found on Xbox 360, but we don't have this confirmed by Nintendo or any official document.
ZombiU and NintendoLand showed me a GREAT lighting system, radiosity lighting on the first one (only seen at Battlefield 3 on Xbox 360 and PS3, and from launch on the WiiU) and a great shadowing effect on the second one (I don't know which name it has, but its really noticeable and improves image a lot), and games like Batman AC had great AA on them despite a bit lower framerate.
But I still haven't seen a game that makes me think "wow, this is better or at the same level overall than Uncharted 3, The Last of Us or Halo4".
When I see them, I will agree in that the WiiU is at least as powerful as the Xbox360 and PS3.