Wii U is really underpower ?

[Akeos]

Gpu was good

http://kyokojap.myweb.hinet.net/gpu_gflops/

Cpu PowerPC was very different than x86, games need a big optimisation to run on it, so a lot of works..

That's good think to use cpu ARM and cores Nvidia in Switch, Nintendo can making 2 or 3 générations of console with this.