The only think that made Wii U "50%" more powerful was its gpu over PS3 and Xbox 360 which isn't much to tout about. Not to mention, Wii U porting is much more difficult than porting games from PS3 and 360. Wii U is Power PC based, and PS3 and Xbox 360 are x86.
all 3 are power pc based.
Graphics comparison:
Blops 2 wii u vs ps3:
Last of US Ps3 vs Ps4
Similar improvements but ps4 owners but TLOUR, Wii U owners didnt bought blops2.
Made a mistake, it happens. Got mixed up with 8th gen for some odd reason.