I don't care one way or the other about perceived Negative/Pessimistic or Positive/Optimistic points of view. What I don't enjoy or have much patience for in game threads is a rehash of topics that have gotten plenty of play already in regular threads, particularly broad sweeping conclusions.
During games the trafic in the regular forums tends to diminish. I feel as though some posters zero in on the game threads solely because they feel it gives them a larger audience for them to orate to. In extreme cases, they don't seem to care about either the day's game itself or the camaraderie among the community that's been developed - we're just a natural resource to be strip mined for eyeballs*, and then discarded if it becomes less rich of a target.
The analogy as usual is to fans watching a game in the cheap seats. Who wants to sit next to That Guy, who invariably turns the pitcher failing to cover first into a critique of the front office?
Talk about the game as it progresses, or engage in small talk with friends and acquaintances - but take the big-picture discussion back to the normal threads except as a very brief aside.
* Admittedly one of my worse metaphors of the year.