The durability of the console, the controller and of course the games....boy were the games great. Say what you will about graphics, open world enviroments and online multiplayer, nothing beats games like Castlevania, the Legend of Zelda, Kid Icarus, Metroid, and the list goes on. I didn't even mind the cartridges and having to blow in them when they weren't working properly...good times. Forget about the Move and Kinect, we had the Power Pad, The Power Glove and of course the Light Gun.
Now stick that in your pipe and smoke it youngins'
My favorite all time console, followed closely by the Super NES.