I'm honestly not fussed over what they've done to Sonic and co.
Like VeeBee said, I haven't really gotten into many Sonic games since Sonic Adventure 2 (in my case, Battle, since I had the Gamecube version).
I tried Sonic Heroes and Shadow the Hedgehog, but...well, I just didn't like how shiny the characters suddenly became. It was odd.
As though there was no texture to their fur, or something.
On a side note, I actually downloaded Sonic Adventure 2 on my PS3 a couple of years ago. I don't play often, except with my daughter now (when the game came out, I learned that there was a character I could like more than Knuckles; Shadow has been my favourite from the franchise ever since).
But back on the topic: I guess it's just a franchise I've outgrown. There were only so many directions they could have gone in, with it. So if this is what they want to do with it now, so be it. *Shrug*