I've seen some screenshot comparisons and the lighting engine in the port is incredibly shoddy, to the point where it pokes you in the eye.BLOPS 2 isn't a poor port. Aside from a few framerate drops in SP, multiplayer is supposed to be just fine.
That, and compared to the 360 or the PS3 version, the WiiU CoD Blops2 suffers from framerate drops when there's a lot of commotion going on - it's still acceptable, but drops nonetheless. Not really the console's fault, but the game could've been polished a little bit more before its release.