Versus threads have almost no discussion value. They don't cause anyone to really be enlightened by anything. People will constantly disagree with each other based entirely on personal preference. Flame wars are common.
You may as well just have two guys sit in your room screaming "HORDE!" and "ALLIANCE!" at each other. It has about the same value of a versus thread.
(I may not bother with versus threads here, even during MM, but I was lurking, more or less, on the Bungie forums during the Halo: Reach beta. I was looking for actual feedback and reasons to submit my own, in a constructive manner. Instead, I saw enough BR vs. DMR [vs. AR] threads to last me five years. All of which were flame wars. The shit hits the fan really, really quickly.)