Funny, I thought the level design in New Super Mario Bros Wii was less impressive than New Super Mario Bros DS. Especially since I could play the majority of the game with just 3 powers (Spinning Mushroom, Fire Flower and Penguin Suit).
I think there was only 2 things in the whole game that required the Tiny Mushroom. And a lot of the things that required the Spinning Mushroom I found other ways to get.
I also saw a lot of repeating themes in the level design.











