For D&D I'd say having a high quality of discussion. Many threads that open up with discuss! often disintegrates into posters just one-timing their opinion, and the non-existent conversation doesn't go anywhere. I appreciate longer answers in D&D that responds to multiple people and multiple points. I also feel that thread responses is more important in D&D vis a vis thread views because if the former is low and the latter is high in a thread, I feel that the topic is controversial, but most viewers don't find themselves informed enough to state an opinion/begin a debate or that there's not much debate to begin with.