I'd agree with everything on that list except Spinball. On the Genesis it's actually quite fun once you approach it with the attitude that's it's not a traditional Sonic game. Plus the music in that game is just jawsum. Howard Drossin is one of the best videogame music composers ever.

Also I would add the Genesis version of Sonic 3D Blast. It was fine on the Saturn but the Genesis one just wasn't happening.