I think most of the pro-Parser people are greatly overestimating the maturity and level headedness of the player base at large. Sure you can have data, but if you don't know how to read it or take into account situations that occurred during the fight that may have cause one player to drop off or one to show a higher % of the DPS then you might as well have nothing at all.

If you've ever worked in retail or even some office environments they are always running reports, reports you WILL be judged by. Many of you may have encountered a know-nothing supervisor who read said report and determined you were lacking without doing any research into why your numbers may have been lower in that particular instance/day perhaps due to an unscheduled meeting or a system issue. Possibly due to an irate customer issue that took up a significant chunk of time.

The real issue isn't whether or not we should have this data available, but if the player base should be trusted to review and ascertain the performance of other players and will they used that information correctly and responsibly.