To find whether there is a good or bad feedback among that gigantic thread is not easy. You have read the posts first as good can be mixed with bad.
What if some buyer/seller say something good while other say something bad? In eBay, you usually directly check only the negative feedback to see what are the common issues with a seller or buyer.
So I would suggest that there are two threads instead:
Feedback for satisfying transactions
Feedback for unsatisfying...