Lets see how they do. 

Answer the following questions on a scale of 'A' for best, and 'F' for worst. If you are not a submitter on that site then just put 'N/A'. The sites I included are just the big 6 and LuckyOliver since Bryan commonly visits here and most of us upload to them. (I think?)

Just copy and paste filling it in.

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1. Ease of uploading:
Shutterstock -
IstockPhoto -
StockXpert -
Fotolia -
Dreamstime -
BigstockPhoto -
---
LuckyOliver -

----------

2. Reviewing process:
Shutterstock -
IstockPhoto -
StockXpert -
Fotolia -
Dreamstime -
BigstockPhoto -
---
LuckyOliver -

----------

3. Earnings:
Shutterstock -
IstockPhoto -
StockXpert -
Fotolia -
Dreamstime -
BigstockPhoto -
---
LuckyOliver -

----------

4. Website Usability:
Shutterstock -
IstockPhoto -
StockXpert -
Fotolia -
Dreamstime -
BigstockPhoto -
---
LuckyOliver -

----------

5. Customer Service:
Shutterstock -
IstockPhoto -
StockXpert -
Fotolia -
Dreamstime -
BigstockPhoto -
---
LuckyOliver -

----------

6. Growth in Earnings/Customer Base/Sales:
Shutterstock -
IstockPhoto -
StockXpert -
Fotolia -
Dreamstime -
BigstockPhoto -
---
LuckyOliver -

----------

7. Community:
Shutterstock -
IstockPhoto -
StockXpert -
Fotolia -
Dreamstime -
BigstockPhoto -
---
LuckyOliver -

----------

8. Overall Grade:
Shutterstock -
IstockPhoto -
StockXpert -
Fotolia -
Dreamstime -
BigstockPhoto -
---
LuckyOliver -

1. Ease of uploading:
Shutterstock - A
IstockPhoto - N/A
StockXpert - A
Fotolia - C
Dreamstime - B
BigstockPhoto - B
---
LuckyOliver - A

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2. Reviewing process:
Shutterstock - A
IstockPhoto - N/A
StockXpert - B
Fotolia - B
Dreamstime - B
BigstockPhoto - B
---
LuckyOliver - B

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3. Earnings:
Shutterstock - A
IstockPhoto - N/A
StockXpert - A
Fotolia - B
Dreamstime - B
BigstockPhoto - D
---
LuckyOliver - D

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4. Website Usability:
Shutterstock - A
IstockPhoto - N/A
StockXpert - A
Fotolia - B
Dreamstime - B
BigstockPhoto - D
---
LuckyOliver - A

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5. Customer Service:
Shutterstock - A
IstockPhoto - N/A
StockXpert - A
Fotolia - A
Dreamstime - A
BigstockPhoto - A
---
LuckyOliver - A

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6. Growth in Earnings/Customer Base/Sales:
Shutterstock - D
IstockPhoto - N/A
StockXpert - A
Fotolia - B
Dreamstime - B
BigstockPhoto - B
---
LuckyOliver - D

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7. Community:
Shutterstock - A
IstockPhoto - N/A
StockXpert - A
Fotolia - C
Dreamstime - B
BigstockPhoto - D
---
LuckyOliver - A

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8. Overall Grade:
Shutterstock - A
IstockPhoto - N/A
StockXpert - A
Fotolia - B
Dreamstime - B
BigstockPhoto - C
---
LuckyOliver - C

you know i was thinking exactly about this type of thing recently - I think it sure would be nice to incorporate something like this into the site where we could see a graph of all the peoples votes.  Just haven't figured out how yet

1. Ease of uploading:
Shutterstock - n/a
IstockPhoto - F  (doesn't read my IPTC, DA is slow and has to be repeated to every image in a series)
StockXpert - A
Fotolia - B
Dreamstime - A
BigstockPhoto - B
---
LuckyOliver - A

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2. Reviewing process:
Shutterstock - n/a
IstockPhoto - C (would get a B if the reviews were faster and Scout was faster in complaints - my last took one month to be accepted, and there is one older ticjet still pending)
StockXpert - B (doesn't get an A mostly for the "we're not looking for...")
Fotolia - A
Dreamstime - B
BigstockPhoto - A
---
LuckyOliver - A
 
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3. Earnings:
Shutterstock - n/a
IstockPhoto - A
StockXpert - B
Fotolia - B
Dreamstime - A
BigstockPhoto - C
---
LuckyOliver - F

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4. Website Usability:  I judged navigation, search tools, uploading tools and statistics; I'm not sure this what was expected.
Shutterstock - n/a
IstockPhoto - C (images load very slowly for me - not in upload, but thumbnails in a search and images when I click on a thumbnail - , advanced search fields sometimes gets over the existing text, great for statistics, crashes in Netscape 7, ample choice of options in advanced search)
StockXpert - B (mostly very good, folders are very useful, I wished I could see stats for all images together - I have to visit each folder to see them - , some problems with translations between the language options)
Fotolia - D (can't edit keywords, problems with searches, statistics are very weak and I can't see total earnings per image)
Dreamstime - B (goods statistics, limited choice of options in advanced search)
BigstockPhoto - B (poor statistics and I can't see total earnings per image; can't edit keywords, but the staff does it quickly when you ask)
---
LuckyOliver - B (easy to use, limitations with Nestcape 7, statistics are very weak and I can't see total earnings per image)


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5. Customer Service:  (from my contributor side; buyers may have another opinion)
Shutterstock - n/a
IstockPhoto - F (slow to answer, never bothered solving my IPTC data problem)
StockXpert - B
Fotolia - C (never have the time to do anything)
Dreamstime - B
BigstockPhoto - A (fast answers, generally problems are satisfactorily solved)
---
LuckyOliver - n/a (I don't remember having need it)

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6. Growth in Earnings/Customer Base/Sales: I don't follow that closely, and sales vary so much every month, so I'll skip it
Shutterstock -
IstockPhoto -
StockXpert -
Fotolia -
Dreamstime -
BigstockPhoto -
---
LuckyOliver -

----------

7. Community:  I don't participate much, so I'll skip it
Shutterstock -
IstockPhoto -
StockXpert -
Fotolia -
Dreamstime -
BigstockPhoto -
---
LuckyOliver -

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8. Overall Grade:
Shutterstock - N/A
IstockPhoto - B (good earnings, painful to submit)
StockXpert - A (great earnings per sale, multiple languages)
Fotolia - B (good for ELs, fast process, searches are still messed up, but my earnings are ok, multiple languages selling well in Europe)
Dreamstime - B (earnings used to be better)
BigstockPhoto - B (medium earnings, but an unbeatable US$30 minimum payout)
---
LuckyOliver - C (low earnings, but so easy to upload)

1. Ease of uploading:
Shutterstock - B
IstockPhoto - F
StockXpert - A
Fotolia - E
Dreamstime - B
BigstockPhoto - C
---
LuckyOliver - A

----------

2. Reviewing process:
Shutterstock - B
IstockPhoto - D
StockXpert - C
Fotolia - C
Dreamstime - C
BigstockPhoto - C
---
LuckyOliver - B

----------

3. Earnings:
Shutterstock - A
IstockPhoto - B
StockXpert - B
Fotolia - C
Dreamstime - B
BigstockPhoto - C
---
LuckyOliver - F

----------

4. Website Usability:
Shutterstock - C
IstockPhoto - C
StockXpert - B
Fotolia - D
Dreamstime - C
BigstockPhoto - C
---
LuckyOliver - B

----------

5. Customer Service:
Shutterstock - C
IstockPhoto - C
StockXpert - C
Fotolia - C
Dreamstime - C
BigstockPhoto - C
---
LuckyOliver - C

----------

6. Growth in Earnings/Customer Base/Sales:
Shutterstock - C
IstockPhoto - D
StockXpert - B
Fotolia - C
Dreamstime - B
BigstockPhoto - C
---
LuckyOliver - F

----------

7. Community:
Shutterstock - B
IstockPhoto - C
StockXpert - C
Fotolia - C
Dreamstime - C
BigstockPhoto - C
---
LuckyOliver - C

----------

8. Overall Grade:
Shutterstock - B
IstockPhoto - C
StockXpert - B
Fotolia - C
Dreamstime - B
BigstockPhoto - C
---
LuckyOliver - D