Maybe not posting a review but if the game is too challenging for you to complete then I do not see how it can be easy.
Now it just seems like you are refusing to admit you were wrong and are changing your story to justify your stance. As someone else pointed out DKC returns isn't hard unless you go for the letters in it.
Why do you not consider challenge mode when reviewing the game. Do you also do that to other games of different genres? When you rate COD is it based on single player or multi player alone? I just see it as part of the experience of the game. It is there to be played and it offers a lot of challenge. To discount it simply because it isn't part of story mode seems odd. Multi play usually isn't part of story mode so I thought I'd ask.
We've had 1 Mario 2d game for the Wii, Ds and Wii U. I am not sure how that can cause fatigue for that style of game and you not be completely fatigued by a lot of games and 3 to 4 sequels offered on other console.