A thread should only contain queries or complaints related to the topic. That is the basis of a forum.
Offtopic replies, either in Market Place or in any other section of the site are removed.
Trader score is there for a reason. A person with 90+ positive score but with 1 negative score would likely mean that there was some freak accident, either with the product, or with the shipping in that particular negative deal etc.
People do their best before dealing with a person. A 98% positive score would make a person curious. He will dig into the scores to find the negative scores there.