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

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2. Reviewing process:
Shutterstock - B (Being noise freaks means failure to accept many potential good sellers)
IstockPhoto - B
StockXpert - D (High % of acceptance, frequent erratic evaluation though)
Fotolia - C (frequent erratic evaluation)
Dreamstime - A
BigstockPhoto - A (4 rejections, 400 accepted)
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LuckyOliver - N/A

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3. Earnings:
Shutterstock - B
IstockPhoto - A (Over 100 less of my images than any other agency, but top earner)
StockXpert - D
Fotolia - C
Dreamstime - A
BigstockPhoto - C
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LuckyOliver - N/A

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4. Website Usability:
Shutterstock - A+
IstockPhoto - D (Moving target in terms of tedious procedure, better now than before)
StockXpert - C
Fotolia - C (I like download details, but what a mess this summer...)
Dreamstime - C
BigstockPhoto - B
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LuckyOliver - N/A

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

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6. Growth in Earnings/Customer Base/Sales:
Shutterstock - B (appreciate the occasion raise)
IstockPhoto - A
StockXpert - A (slow start, moving up as time passes)
Fotolia - C (Should raise baseline commissions)
Dreamstime - B
BigstockPhoto - C
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LuckyOliver - N/A

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

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8. Overall Grade:
Shutterstock - B
IstockPhoto - C (I'm making money despite horrific uploading procedure)
StockXpert - C
Fotolia - C
Dreamstime - A (My overall fav site and No. 2 earner)
BigstockPhoto - C
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LuckyOliver - N/A