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Well, in my eyes a "good" one would be one that most people could relate to and give their honost opinion about that subject and tell of their own personal experiences with such topic. And said topics should be mostly about mature and non-sick subjects. Of course, a couple of these "bad" threads here and there are nice for change of pace, but not continuously one after another. But in the end, it's in the eyes of the poster that one could subject a thread as being good or bad.

(Hopefully I don't make any enemys in my uproar over said threads.)