I once played a game with an in game parser, it was called a scorecard. And at the end of a raid or dungeon it would pop up on the screen and give you the total damage out each player did, as well as damage in, healing out, healing in, how many times you died, how many times player X picked up someone so on and so forth. I cant tell you how much better that game would have been with out that scorecard.

All it did was breed bad players, players wouldn't stop to help you up, wouldn't dodge damage because it would interfere with their damage out, healing out, which in turn would cause them to die and no one would pick them up because of the same mind frame, and well you get the point "wipe". And then the snubbing of players because player A did X amount of damage less as compared to player B, you guys and gals get the point. A parser will not make someone better, only practice and experience can do that.