As a rule, if the posting is fact-based with links and except of the text you are talking about it will stay. especially if the opinion is both neutral and fair.

obvious bashing will be deleted (but sometimes the line is thin between opinions and bashing so stating facts with links, even if there is some negative will help with that)

We are not against someone posting something that could be negative, we are against someone posting negative things with no facts and no links (or really old news that does not even apply anymore....mostly because those are the tools used by amateur short-sellers, and there is simply no room for them on this board)