One of my favourite subjects.
The N64 has a lot of really good and exciting games that you can easily pick up today and that are timeless.
For me, the beste N64 game is still GoldenEye 007
! Why? Because it was so revolutionary, so well designed with so much details and wellbalanced missions that I never stopped playing it. One of the best examples of an absolutely awesome game that made a deep impact on all the following "stealth/tactical-shooters". And it aged better than Ocarina of Time or Mario 64.