Pros:
-The ost is nice.
-This game has brand new levels with creative ideas, basically the likes Unleashed, Sonic 06 or Sonic The Secret Ring.
-The game is well balanced in terms of difficulty.
Cons:
-The 2D sections are badly done, which makes the game a little too "platformy" whilst the game is about running fast. Those sections just slow down the gameplay. (As a whole, I don't think that it was a bad idea, but it was badly executed).
-Fucking remote controls. It's hard to control Sonic and the very first wisp is a shore to use because of the wiimote. I literally had to play the game on a pro controller.
-The story needs some work, but it's not as awful as people are making it look like. Mario has the same dumb story every game, so yeah there's worse out there.
It's honestly worth a try, but please buy a pro controller for the Wii.