People seemed to absolutely hate this. I thought it was a good continuation of the Sonic Colours/Generations gameplay. The modern Sonic levels were a ton of fun, and the levels as your own character allowed for a few different approaches based on your selected options – and as you could create multiple, you could try them out in different ways.
The game also had Classic Sonic levels, but these were just fine. They didn’t really fit the rest of the game and Classic Sonic just seemed out of place, both in gameplay and in the oddly serious story starting with Sonic defeated and Robotnik taking over the world, and the rest of the cast forming a resistance. The serious tone adds to the cheesiness of Sonic, especially with people talking to your mute crazy-looking character.