The only issue I have with parsers is with SUCCESSFUL parties. It inevitably takes the question from whether or not content is being cleared efficiently to whether or not it's being cleared with the efficiency of a world's first, record-setting party. So what if it takes 60 seconds longer to clear the fight. Was anyone dying unnecessarily? No? Were the healers under too much stress because people kept eating attacks? No? Were the tanks losing aggro? No? Does the entire party understand all the mechanics? Yes? Then who cares?!