I think there are two different eras of video gaming, BPS (Before PlayStation) and APS (After PlayStation). For better or worse, Sony changed the video game world drastically. Here's how I rank the systems from both eras:
BPS
1. Super NES
2. Genesis
3. Game Boy
4. NES
5. Saturn
6. Atari 2600
7. Game Gear
8. Sega CD
9. 32X
APS
1. Dreamcast
2. Nintendo 64
3. PlayStation
4. PlayStation 2
5. Game Boy Color
6. Game Boy Advanced
7. Game.com
I only listed those systems that I've owned. So while I've played the Virtual Boy, the X-Box and the Gamecube, I haven't played them enough to rank them.