Well Jet Force stood out to me as a game for a couple reasons.
One being the imense fun of it all, another being the music... I dont say this often but the music in this game was awesome
And the whole part with you being able to be a dog... pretty sweet if you ask me : D
Multi-player gave me and my friends hours of fun. First game I played in which you can actually play as the enemy in a death-match style game. The weapons were pretty sweet. And single player was cool beans. It was super fun. Although at some times it really pissed me off.
To me this is one of the greatest games for the N64.