Even though I was never a true fan of the Sega Genesis or Sega in general, I preordered one. Back in the 90s I owned the NES, SNES and GameBoy and then got a Genesis. I never really built up a library for the Genesis because of "The Sega Channel" which was an adapter for the Genesis that hooked up to the coax cable in your house and allowed you to download games to the Genesis and play. Most of it was demos and trials, but what I remember is the following titles.....
Sonic 1-3 and Sonic Spinball
So my experience even to this day is very limited with the Genesis.