Ya gotta try games yourself to really make an opinion, because the reviews aren't YOUR views. That, and to hell with X-Play, as they bash anything remotely related to any "big" anime series (Naruto, DBZ, Yu-Gi-Oh!, etc.), and all I can really gather from them anymore is that all games must be on the level of GTAIV, or else they suck. They have fallen greatly...

And to the demo, to the best of my knowledge that's the very first level of the game, Apotos Act 1, that was in the demo. One thing to note is that in the portion you played, you're not meant to wander around, just blaze foward as one seriously fast blue blur. Wandering around comes in with the hub world (where all the levels are linked together and such), and in the Werehog nighttime stages. In the Werehog stages, you get to smash everything into oblivion, focusing more on platforming and combat instead of speed and reflexes.
Otherwise, I don't know much else having only played the demo myself. This game does seem awesome though, and quite afew people on this board seem to like it, so I plan to try and rent it sometime!