Ummm the WiiU has been out for over half a year, I would kind'of expect it to have more exclusives than the other two. It also missed out the 8 or so games like Outlast that Sony showed off at EA which if we are counting console exclusives (as they are on the X1's list) should be there.
http://www.youtube.com/watch?v=2GPf3MdVOKI
So yeah it's just a skewed list really.