I really enjoyed Sonic Advance 1 and 2, I especially like some of the music in Sonic Advance 2. However I think that one of the main hallmarks of DIMPS style Sonic is that the gameplay is reactive instead of proactive. When I play genuine Sonic Team games from the 90s I feel empowered by the level design. For the most part the zone are playgrounds for Sonic, and the action is player driven. On the other side of the coin is DIMPS style gameplay, which I also saw in some parts of Sonic 4: the levels dictate the action, not the player. Sonic is thrown about by level gimmick after gimmick and you don't really get that same feeling of being in control, you're just responding to random stuff that is involuntarily tossing you about the screen.