1. NES
I had owned NES two times but it has been well over 20 years since I've played one. Certainly has the most playtime, although I'm fairly certain that it is nostalgia that is holding this one at this rank.
2. SNES
I have very little actual playtime on SNES and have played very few games. I may have played less than 10 games ever on this system, which seems strange even to me.
3. Game Boy Advance
Another system that I have not a lot of playtime on, but this one I actually own. This is probably the top-side of positive experiences.
4. Game Boy
Had one of these growing up and have more time on it but still not a lot of game experience. Another with likely less than 10 or even 5 games been played on it. Is below GBA only because of graphics and backlight not being present.
5. GameCube
Technically own one but never used. Had played some games at a former co-workers house maybe 15 years ago with the majority being one of the Worms games.
6. Wii
Have played more Wii games than any of the above consoles besides NES. Do not like the motion controls. Platformers that use standard controls are ok, but I have only played on of those which was a Kirby game.
7. Nintendo 64
Have played more games on N64 than any of the above except for NES and Wii. Back in the days of CRT, the bad graphics weren't a problem, as time went on it became a big issue. Another is that I could never get used to the standard controller.
8. Virtual Boy
A roommate had one of these and I tried a couple of games about 20 years ago. I did not enjoy the experience and have since thought the system is overrated.