I organized my collection of NES games yesterday ( http://bit.ly/14bKp4J ) so I could sell a couple. I also decided to do a quick rank of quality vs year released:
(The blue line is because someone else asked me about NES Console sales by year which took awhile to find but eventually appeared).
Personally my favorite games (outside of the common stuff like Tecmo Super Bowl, Super Mario 3, Zeldas) are stuff like Bomberman II (great three-player mode), Dragon Warrior IV (probably the pinnacle of the NES), Destiny of an Emperor (helps that I was a big "Romance of the Three Kingdoms" fan; also this game makes every other RPG look like it's crawling!), Crystalis ( great action RPG), Palamedes (bizarre little Hot-B title that is a fun challenge involving dice), Maniac Mansion (here's a l speedrun on a real NES) and Micro Machines ("Eliminator Boat Duel" is a similarly fun two-player romp).