Don't worry, just step into the angry dome and let it all out.
I honestly could not find a difference between the Wii U and 360 version of the Darksiders pic you brought up.
Let's play spot the Difference!
Okay, Here's where the Wii u version is lacking:
1)Missing the trees in front of the stone
2)Ground textures are worse
3)Grass models are worse (more clumped together, square, unnatural-looking)
4)How the portal-looking thing looks worse around the edges where it connects to the cliff-face
5)Worse Anti-aliasing on both the character and horse
6) Worse anti-aliasing on the bars underneath the horse picture
So yeah, those are just the really noticeable ones.
But it doesn't matter, cause it's not like it's the Wii U's problem it's lazy developer syndrome (as usual).