I mentioned this once before, but playing the Genesis / Mega Drive using HD Retrovision cables with component or an RGB connection is such a dramatic improvement over the poor composite output that the Genesis had in the USA in the 90s. It makes it feel like a fresh new system.
Back in the day I didn't give the Genesis much thought as all I could think about was 63 onscreen colors vs the SuperNES's 256. It seemed an open and shut case as to which was better... I wasn't aware of games on the Genesis that were as good as Zelda or Super Metroid, and the FX chip seemed much better than the VR Racing experience.
However, going back to the systems and viewing them on their own terms, I've really had a chance to get into some of the Genesis games. Streets of Rage 2 is an absolute master piece. It does what the system is capable of and does not try to use too much dithering. The sound is excellent as well. I highly recommend you connect your Genesis / Megadrive up to a good sound system with a subwoofer to really enjoy some of these games.
The large amount of parallax scrolling in Genesis games and the overall lack of slowdown is really a treasure to see and experience across the software library. I also didn't realize that the Sega CD not only has more storage and sound, but there are additional effects/processing as well. The Batman game is quite well done. Connecting a mouse is also a nice way to play games like Rise of the Dragon etc.