One of the best Mario games in a long time.
Speaking of the Raccoon Suit, I think this is one of the best power ups to come into the Super Mario Brothers series, you can glide, shoot up high, or slowly glide down over coins. This was just a really enjoyable power up for me and I really like it. Thats really the only new power up, there are 2 small yoshi's you can use also one thats pink that can inflate like a balloon, and a blue small yoshi that shoots out bubbles and these are more great additions to the game that make it fresh and fun.
The difficulty, my God the difficulty, if you are expecting an easy challenge then this is not the mario game you want to play. It's perfectly executed throughout the game and while it can be frustrating, it feels so worth it once you beat the game. The bosses are actually really good on this one, in previous installments Mario bosses feel like you are facing them 7 times over and over, but in this one they are all really different and challenging, and even the boss fight with bowser is amazing and its actually a huge change from what most bowser fights usually are. My only complaint with the last boss is that you must go through some of the level which is really difficult and they can't even give you one mushroom to help you through the hardest boss in the whole game.
Overall it's been a while since Mario has had this good of an outing, there have been some good ones but this one was just really great I really enjoyed it. If you like Mario you will love this game, and if you just got the Wii U, this is a must have title for it.