the Kayo people are easily the most beauteous and righteous people...they consider what the fans say, they respond, and are educated, so you don't tend to get lots of the immature posts many other boards seem to cultivate. Plus the music is entertaining AND challenging, a rare combination in metal.
One of my favorite boards, not just on UM but the entire internet.
It also helps to read the posts for a few days before forming an opinion, because once you know who is who, it all starts making more silly sense.