A wonderful addition to the Sonic series, but that doesn't mean it's perfect.
Let's start with the gameplay. The daytime levels are outrageously fun when you go as fast as you can. The level design is good, but not as good as the Wii version's design. The enemy's are well thought of and simple to defeat. Sonic also still has the classic Homing Attack move, in which is used in levels numerous times. But the nighttime stages are a different story. In the nighttime stages, the lovable blue blur is replaced by a freakishly strong Werehog. The controls themselves are very unresponsive when in a middle of a combo, so creating new combos is somewhat of a challenge. Want to go supersonic speeds across the levels? Unfortunately, Sonic's speed also dissapears when he transforms, so most people hate transforming into the werehog.
The story is very well, with beginnings and endings that are sure to leave you memories. The ending is somewhat sad, but I don't want to spoil it to those who haven't completed the game yet. The cinematics in the beginning and ending of the story are stunning, and obviously Sega put a lot of effort into them. The other cutscenes aren't as beutiful as the others, but are still a sight to see.
The controls for the game could use some work, especially in the Werehog stages. If you want to slow down while going down a ramp, it takes an awful lot of time to completely stop, depending on how fast you're going. As mentioned earlier, the werehog controls are very unresponsive when attacking. The framerate also decreases if you're beating up tons of enemies in one place. Other than that, though, the camera is actually pretty nice.
I strongly recommend this game to any diehard Sonic fans out there, and also to many newcomers in the Sonic series. This game has respectively earned an 8.5 out of 10 from me.