We already have a thread rating system, it's just no one still uses it
Also with the one in place it offers stars in the section next to the thread. They don't get hidden, but let's just say a 1 star thread is either a poop topic or has been trolled.
I seem to remember a certain Australian kid here a couple years ago, wasn't liked by many, and even his informative posts were trolled to one star levels. Seems no matter what we add, its always the bad apples who destroy its real usage for everyone....thread tags ....anyone remember that fiasco?