1. SNES (simply the best game library, tons of great platformers and RPGs)
2. NES
3. N64 (The golden age of Rare)
4. Wii
5. Xbox 360
6. PS2
7. DS
8. Dreamcast
9. Gamecube
10. Playstation

lolz good one.

10. Nintendo Wii

9. Amstrad CPC 464

8. PSP

7. N64

6. Playstation 2

5. Game Boy ( I'm counting all incarnations here as they all meld into one in my memories)

4. SNES

3. Playstation 3

2. Playstation

1. PC

1. PS1

2. PS3

3. SNES

4. NDS

5. PS2

6. Gameboy Advance

And that's all I had (Haven't had PSP long enough to rate it)

Just considering games

10. Nintendo DS

9. Gamecube

8. XBOX 360

7. PS3

6. GBA

5 Wii

4. Xbox

3. N64

2.PC: if it even counts of course...and not incuding emulators/games originally on consoles long ago.

1. SNES: the big four were spectacular!

Current ranking: (it changes like 3-4 times/month )

1. Wii

2. SNES

3. PSX

4. PS2

5. NDS

6. N64

7. GC

8. GBA

9. NES

10. PS3

10. Xbox

9. Gamecube

8. GBA

7. GB

6. PSP

5. PS

4. Xbox 360

3. PS3

2. PS2

1. PC

Though I must say that my list is heavily biased to this gen because I started hc gaming this gen.

I only started gaming last gen so I haven't even played 10 systems.

But here goes:

1) PS3

2) PC

3) Xbox 360

4) PSP

5) PS2

That's because I didn't own a PS2 :( but played it at my friend's house thought it was dumb compared to my PC. 

Hrm... a top 10 consoles list? It's not an easy one, but I'll go for it:

10. Atari 2600

9. Game Boy

8. Dreamcast

7. GBA

6. PS1

5. NES

4. Wii

3. PS2

2. DS

1. SNES

10. Nintendo Gamecube

9. Atari 2600

8. Gameboy 

7. Gameboy Advance

6. Super Nintendo

5. PS3

4. PS2

3. Nintendo 64

2. Nintendo Wii

1. NES