Oh this is a great question!!
First,
Super Mario 3 - Played the absolute heck out of that game and loved every inch.
Ocarina of Time - In my view was the absolute most perfect Zelda title. I've loved several of the sequels since, but that one remains the best.
Mystic Quest - Was actually my first RPG experience as was it's intent, and I've played many since. It's simple, but a classic.
Final Fantasy 7 & 8 - I enjoyed both of these equally and immensely.
X-Men Legends 1 & 2 - Just great fun all around
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