Amazing hedgehog parts but slowed by the werehog.
There is a leveling up feature to the game which works well but doesn't appear to do much for you, maybe it's just too slow to notice though, I'm not really sure.
The hedgehog parts are giving very good graphics with high polygons and awesome textures blazing past you so fast you can barely catch a glimpse of them. It also gives you very good control over sonic and the only thing i have found that has bugged me about them is when you attack enemies or home in on objects. Sometimes you just go the way you don't want to, but it's not a big problem by any means. You have a lot of quick action events thrown at you throughout the levels and it's almost an over use of it, but once again, it does not ruin the experience. The levels switch between side scrolling, behind sonic, and everything in between and it works well and is a lot of fun. In fact this area of the game I would give a 10 for the genre if only it was multiplayer, and i know that's asking a lot especially with the engine working so great how it is, but it would really add a lot more.
Now the werehog parts is where the problems start. First of all the music that kicks in when you're fighting is just awful and very repetitive which is not an issue in the hedgehog parts at all. Other problems are bad camera, fighting parts too frequent, and buggy controls. The camera tries to think for you which can become a problem if you're trying to jump one way and you end up going another and dying. Fighting can be fun especially when you level up and have lots of skills but you're put into a battle far too often. The controls themselves aren't necessarily bad but grabbing ledges and things like it can not work properly and most of the deaths you encounter are most likely caused by this. When you die there are never enough checkpoints to send you back to a reasonable place so you end up doing something that took 5 minutes over and over until you get the end just right which isn't that much of a problem as it is an annoyance.
Other than the problems the werehog parts are actually quite nostalgic of games like Banjo Kazooie and other platformers and can be fun. But it fails to achieve the same goals. On the other hand the hedgehog parts are what make the game so your decision on buying the game should really go with that. Overall I would have to give it a 9 or a 9.5 because it is great but you have to suffer through some annoying parts.