Phew boy, I had to go all the way back to my second post to get my list. It's tough, but I'll rate them.
1. SNES: 9.4/10
2. Genesis: 8.6/10
3. TG16: 7.5/10
4. NES: 8.8/10 (actually I bought this much later, but my list got screwed up a bit and I just can't be bothered to re-position it).
5. Gameboy: 8.5/10
6. Gamegear: 8.0/10
7. Jaguar: 0.00001/10
8. Saturn: 5.5/10
9. Nomad: 2.7/10
10. PS1: 9.8/10
11. Nintendo 64: 9.2/10
12. Gameboy Color: Same as Gameboy
13. Dreamcast: 8.3/10
14. Playstation 2: 9.6/10
15. Gamecube: 8.1/10
16. Xbox: 7.2/10
17. GBA: 6.4/10
18. Wonderswan Color: WTF/10
19. PSP: 9.1/10
20. DS: 9.0/10
21. Atari 2600: 8.2/10
22. Wii: 8.7/10 (of course, it's new, so the score may get better or worse as time goes on)
23. Virtual Boy: 1.5/10
24. Xbox 360: 8.7/10(of course, it's new, so the score may get better or worse as time goes on)
I really can't decide between the 360 and Wii. Both are great consoles. That said, I used a reviewer's scale and I'm not ashamed of it.