As Nintendo's first high definition console, Wii U will join the neverending, nothing-really-proven debate between the PS3 and the Xbox 360 over which console's visuals for whatever multiplatform game are superior. Some people are convinced it's a bad port, others are convinced it proves inferior hardware.
It doesn't sound like Mass Effect 3 or Ninja Gaiden 3: Razor's Edge are the best candidates to show off the new console's graphical capabilities. 1Up, in its review of Mass Effect 3, said the game "seems a lot less visually stable," than the Xbox 360 version, with choppy frame rate, "rougher" animation and even worse audio in the game's spoken dialogue. (Jason Schreier, in his time with the game so far, hasn't noticed any hardware issues with the Mass Effect 3 visuals. Here's a video of him testing out the game's Wii U features.)