1) Super Mario Bros. 3
2) Contra
3) Tecmo Super Bowl
4) Double Dragon
5) Blades of Steel or Ice Hockey (toss up on this one)
Those are the games I had the most fun playing. I would probably put Super Mario Bros. 1 and a few others on the list for what it did for Nintendo but I went with pure fun factor. I also wanted to give a shout out to Arch Rivals.