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T&C Surf Design is great for two players.  It's a shame it isn't very runnable though.

Since the usual suspects have already been mentioned, I'll go ahead and nominate Double Dragon 2.  It has superb controls and is a benchmark title for the beat-em up genre imo.  I also really like Faxanadu, it has a proto-metroidvania kind of feel to it.
I would have to say Blaster master is at my #1 spot then 2nd would be Final Fantasy 1 and 3rd even though allot of people didn't like it I loved it and still do to this day is double dragon 3.