My Favorites:
(don't want to rank these album, just putting them in groupings I tend to listen to certain Joni Mitchell albums together, depending on my mood often listen to ones that are close in time chronologically )
Song To A Seagull
Ladies Of The Canyon
Blue
For The Roses
Court And Spark
The Hissing Of Summer Lawns
Hejira
Unfortunately, have never gotten into the albums later than "Hejira", guess I'm stuck in the past!

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Top ten:

1. Court and Spark
2. Blue
3. Hejira
4. Ladies of the Canyon
5. Turbulent Indigo
6. For The Roses
7. The Hissing of Summer Lawns
8. Don't Juan's Reckless Daughter
9. Wild Things Run Fast
10. Both Sides Now
    Bottom three:
11. Mingus
12. Clouds
13. Dog Eat World (though I do really like "Good Friends")

for me, it would go like this (favourite to least favourite):
song to a seagull (my absolute favourite)
turbulet indigo (very close second)
night ride home
blue
mingus (if there were more songs on this it might be my #1)
both sides now
ladies of the canyon
for the roses
court and spark
the hissing of summer lawns
dog eat dog (for me, not as bad as some make out. quite catchy)
travelogue
don juan's reckless daughter
hejira
taming the tiger
wild things run fast
chalk mark in a rainstorm
shine (i wish i liked it more. i still think it needs to grow on me)
clouds (i like it but i dunno, half the songs are pretty unmemorable)

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Thank you for the list nagyovafan. I have not heard all of the albums you listed.
I'm happy to see Court and Spark so high on your list. I absolutely love it and don't understand why it is not generally regarded as one of her masterpieces. Blue and Turbulent Indigo are also my favorite (these 3 would also get 10/10 from me). However I never got into Night Ride Home or Dog Eat Dog but I will give them another go, especially Night Ride Home. I agree with giving Ladies of the Canyon (8.5). It is very good but not perfect.
I will post my list once I have heard most of her albums.

This comment is most likely authentic and fairly close to what I intended to say

(out of 10) of the ones that I have.

1. Court and Spark (10)
2. Blue
3. Night Ride Home
4. Turbulent Indigo
5. For the Roses
6. Shine
7. Hejira (9.5)
8. The Hissing of Summer Lawns (9)
9. Miles of Aisles
10. Don Juan's Reckless Daughter (I just got this one yesterday, but I think it will end up in this position)
11. Ladies of the Canyon (8.5)
12. Travelogue (8)
13. Dog Eat Dog
14. Wild Things Run Fast (7)
15. Taming the Tiger
16. Chalk Mark in a Rain Storm
17. Both Sides Now (6)
    Wow, she is friggin' brilliant. I think the first 7 listed are truly masterpieces.
    -Joe
    Southland Tales
    The Fount7ecain
    Inland Empire