Get the Sonic Genesis Collection and play all RPGs in it, I think it has the whole Phantasy Star series.
And besides RPGs, I would really recommed Shenmue 1 and 2, Panzer Dragoon Zwei, Ecco the Dolphin 1 and 2, Streets of Rage 1 and 2, Contra Hard Corps (the best Contra of the 16 bit era) CastleVania Bloodlines (the best Castlevania of the 16-bit era), Shinobi 1 and 3 and Shinobi Legions (Saturn game), Gunstar Heroes (when you beat that game in expert mode you can consider yourself bad ass), Splatterhouse 2 and 3. Genesis also had some of the best spaceship shooters The Thunderforce series, especially 3 and 4. Oh, and if you can get Snatcher for Sega CD (although it was remade for PSone and Saturn, but I don't know if those versions were ever translated).
