A Sonic game without the hype Sonic delivers...
Story: 6 (Four teams with almost the exact same story with the same typical ending)
Graphics: 5.5 (Character models look bad while the backgrounds look good and different in every stage)
Music: 8.5 (A very modern Sonic-style tone throughout the game, just seemingly modernized to a pop-like sound, both good and bad on my opinion)
Controls: 7 (Controls can make a player be afraid of holding their game-pad while in a stage full of jumping or running nearby a cliff)
Sound: 5.5 (Half of the voices are good, half of them are horrible, everything else do their part without fault)
The story starts out differently with the four different teams:
Team Sonic: Tails and Knuckles find Sonic and hands him a letter from Dr. Eggman (Robotnik) and he claims to have a weapon powerful enough to take over the world in a matter of days, then the trio set out on stopping him.
Team Dark: Rouge tries to find Eggman's secret treasure and only finds Shadow and the most powerful of Eggman's E-series robots (or whatever the robot is called), they eventually see Eggman as the enemy and go after him.
Team Chaotic: The Chaotic detective team are in need of money and receive a message from an unknown sender (ironically), in promise of money in exchange for tasks to be done.
Team Rose: While Amy is thinking about Sonic (too much), Cream is trying to help Cheese find her chao friend, and "Big" is searching for a friend (who is a frog), when they see an image of a hedgehog resembling Sonic holding a chao and frog, they decide to search for him to find out "why".
The game-play is where the majority of where the game faults (other than the mediocre story, voice acting, and influence). The styles of the classing elements we know and love from the original Sega games are somewhat inspired in this game, which is a good thing of course. The stages all act differently and all hold a unique "touch and see" feeling towards the acts, etc. (what I'm trying to say is that the stages are different and all have something interesting to offer). The camera can be really frustrating at points where going into the next stage can be important, and has really caused a lot of falling in many aerial stages and areas throughout the game. The comparisons between the levels and "teams" are unfortunately too similar, in fact the only reason to complete all four stages is for a "spoiler" (honestly not worth playing, even for hardcore Sonic fans, unless they really want to) and etc...Also the co-op isn't necessary, and the challenges and time trials don't make anything more meaningful.
If you really want to play this game, rent it or borrow it from a friend, and take your time to consider if it's really worth it.