Sonic the Hedgehog - Mega Drive: I still keep the cartridge
Barbarian II (Psygnosis version) - Amiga: Not a perfect example for a platformer either but I like it to this day.
Wonder Boy III the Dragon's Trap - Master System: If you haven't played it yet, do it today
I don't like to play plumbers with gay mustaches in a game so I never liked Mario.