No real answer to that.
There will always be someone that has had a bad day, or had a fight with the wife etc that will pick on a post.
I think part of the problem is that the whole manner's thing goes out the window when people are on this forum (some people I should say).
It's common place on this forum for someone to make a fairly harmless comment, only to get absolutely flamed by some person or people that think it's ok to run people down.
I don't think that there is one answer to your question, everyone will have an opinion as to what makes a good thread, however it is impossible to state with one answer what actually does make a good thread or post, as it is usually only relevant to the poster, and a handful of others who are looking for the same info, or have had the same experience.
The forum Nazi element has shot up in here over the past couple of years, and it's a damn shame.
I have been using MTBR for some time as well, and I find it interesting that I am yet to cop abuse for having an opinion on that forum,
I think the mods really need to crack down on the abuse stuff in this forum.