I don't like them because of how some people use them to yell at others and put them down, it's a little upsetting, and in a raid that makes it bad for moral. To answer the other question, I'm at the top without dying and doing my role correctly, I don't tend to make a mistake in a raid or a dungeon, unless some obnoxious roommates of mine decide to barge in and talking to me, that is the only time I make mistakes, because I get distracted, but if you want it just for your personal usage and not use it to yell at others or chew them out, then I'm ok with that reasoning, I just don't like elitists and their nature of using the damage meter.