It seems that not content with making huge amounts of games with its own franchises, Nintendo is doing it with Sega's as well.
That said, the new Sonic is a positive step towards innovation, and the WereSonic could add some really interesting gameplay - think like Supersonic back on the megadrive, only without the hours of Chaos Emerald collecting frustration.
Unfortunately, when using games as famous as Sonic with such a huge fanbase, it is very hard for devs to please an audience. Seeing as most video game critics grew up with Sonic and have it as a fond memory, I imagine any changes to their rose-tinted retrospect will earn Sonic Unleashed some pretty scathing reviews.
Think back to Deus Ex : Invisible War. If it were simply called Invisible War I can imagine the fanbase and critics being much more charitable towards it. As a sequel the gameplay was to dissimilar from the original for the fans' liking, and not different enough for the critics' liking.