N64 is my favorite Nintendo system and my favorite system. Too bad it is underrated due to not as many games as PS1. I always said (that generation anyway) it was quantity vs. quality.
You got:
-Super Mario 64
-The Legend of Zelda: Ocarina of Time
-The Legend of Zelda: Majora's Mask
-Goldeneye
-Perfect Dark
-Jet Force Gemeni
-Star Fox 64
-Diddy Kong Racing
-Super Mario Kart 64
-Super Smash Bros.
-Banjo Kazooi
-Konker's Bad Fur Day
-1080 Snowboarding
-Wave Race 64
-Mission: Impossible
-Shadows of the Empire
-Rogue Squadron
-Donkey Kong 64
And not to mention superior versions of The World is Not Enough, Resident Evil 2 and not to mention a just as good as version of Spider-Man of that generation.
And that is off the top of my head. It really was a masterful system that released the highest quality games for one system I've ever seen and that includes my favorite game of all time, OOT.
On PS1 I go back to play Metal Gear Solid: 1 (which a better version is out on Gamecube), Resident Evil 1 (like Gamecube again) and Final Fantasy VII and Final Fantasy VIII. Making this list for N64, outside of Conker, Wave Race and Donkey Kong that entire list is instantly replayable for me.
I alos really liked SNES, but was a Sega Genesis "man" in that era and loved the NES as well (my sister and I's first console, for which we only had like 5 games but we played them infinetly). Gamecube was all right, but really disappointing (the games, not hte hardware or controller). Too early to say for Wii right now, but things are looking good.