I don't know. I heard good things about it but I saw some Modern Sonic gameplay and was disappointed that about every level just randomly turned into a 2D side-scroller. That's what Classic Sonic is for. I was hoping to see many of the old levels recreated in full 3D, similar to Sonic Adventure 2's Green Hill Zone. That boost ability just completely ruins the game as well.
Also, why does Super Sonic jump just as high as normal Sonic? Yes, he has more acceleration, but his better jumping abilities are what made him stand out from other characters' super forms.