In your experience (no armchair theorizing, please), what are the posting styles of each of the types - at their best and at their worst? What do they contribute to threads? What do you appreciate about having them around? How do they annoy you?
Before we begin, let's all remember not to take anything personally. If enough exemplars of a type exhibit a behavior, the type can legitimately be associated with the behavior; that does not imply that any individual exemplar necessarily behaves that way.