Could have been better
Now if the Sonic Team just had left the Hedgehog stages then this game would have been fine but no, they added the tedious and mindless Werehog stages. Now why the werehog stages are so bad?. Well, the first reason is that the battles are pretty stupid, you just have to move the wiimote and nunchuck and see how the enemies die, also sometimes the controls arent so great and you will fall sometimes, oh by the way you lose the speed that you have in the hedgehog stages.
Now on the story, it is interesting will the whole dark gaia business but the new sidekick of Sonic, Chip is kind of lame, at least they could have given him a better story, at least only Amy and Tails appear in this game and of course Dr. Robotnick (refuse to call him Eggman).
The music is bad, pretty bad perhaps except the orchestral version of Endless possibilites, believe me the werehog fight music is bad and you have to listen always when you fight except with the big guys.
The final words will be that Sonic Unleashed is fun with the Hedgehog stages and bad with the Werehog stages, bosses are kind of easy except the last one.