The reviewer is obviously biased against the Wii U, he took off one point only because he apparently didn't like the Murfy stages.
It's like if you took a 9.0 game, added free bonus content to it, ended up not liking that extra content, and took off one point because of it. It makes zero sense.
Not really because the Murfy stages are not optional. I own the game on the Vita and I actually kinda liked them to begin with but they do get kinda arduous.
Still to dock one point just for that seems harsh. Unless they are super amazing without touch screen controls that is.