I was just going to say Sol-Feace is awesome...to each their own I guess, haha. That game is worth it for the redbook soundtrack alone.
-Final Fight CD is probably the best version of the game on a console, still tons of fun 2-player
-Robo Aleste is very enjoyable
-Soulstar and Silpheed are worth a play-through
-The Working Designs games are all worth playing - Vay is the weakest IMHO, the Lunar games are reason enough to own a Sega CD
-Snatcher is overpriced and overrated - in no way shape or form is it worth the pricetag, but it's worth a playthrough if you can borrow/burn a copy. You'll beat the game in like 40 minutes and wonder what the hype is about.