I will post the verdict here. Go to the link for the full article. Not that long and makes for a good read
What looked like graphical tweaks from the press materials failed to materialise - FXAA apart - but thankfully some of the more alarming reports about Wii U graphical deficiencies turned out to be of little consequence to the final product. However, what we have here is a disappointing current-gen port with some bundled DLC and some interesting - if not totally convincing - touch-screen upgrades.
The overall takeaway is that the Wii U version of this classic title is unpolished and less enjoyable to play than Rocksteady's original. On top of the variable frame-rate, we were also disappointed to see the odd moment of more noticeable LOD popping and jerky FMV sequences suggesting that this version has some streaming issues. Unreal Engine titles background load data concurrently with streaming video, and you can hear the drive head zooming about, almost as if it is struggling to maintain both tasks - the halting playback adds further to the impression that this is a rougher, jerkier, more lacklustre rendition of the original.
It's Arkham City, and by default a good game, but the basic reality is that we'd take any of the older - and now cheaper - versions of this excellent title ahead of the underwhelming Wii U port.