Hi everyone,
like anyone when you search for suppliers, you want to read about his reputation online. This includes first if he is a scam or not. I think that is the easiest part. It is offen enough to search in trusted directories such as salehoo.com or others, searching his website and you will soon get the answer.
But the big problem is to read many confusing reviews about the suppliers and trying to get the right big picture. 
Example-1:
lightinthebox.com   salehoo reviews: 21 with the score 2 from 5
lightinthebox.com   resellerratings reviews: 5046 with 8,86 from 10
lightinthebox.com   trustpilot reviews: 1449 with 8,6 from 10
lightinthebox.com   keryet.com reviews: 22 with 4,41 from 5
Example-2:
chinavasion.com    salehoo reviews: 28 with the score 4 from 5
chinavasion.com    resellerratings reviews: 4495 with  8,5 from 10
chinavasion.com    trustpilot reviews: 3 with  6 from 10
chinavasion.com    keryet.com reviews: 35 with  4,14 from 5
The first Question:
So the question is: how to understand and deal with the opposite reviews 
(21 with the score 2 from 5) vs. (22 with 4,41 from 5) ?
The second Question:
How far is it possible for these suppliers (and other ones) to fake both the reviews in these rating websites and offcourse on their website?
Best Regards