The only justification I could rationalize for anyone to be against damage/healing meters is that they don't play well, they know they don't play well, and they're too stubborn to improve. Half the fun in an MMO is gauging your performance and how you improve over time with gear/execution. I don't understand how this is even a debate. I completely disagree with the notion that you should only be able to gauge your own performance. I like being able to see how I stack up against others and if/when I'm not at the top it only pushes me to get there. I like being able to analyze what others of the same class are doing differently than me if they're outperforming me and if they're not, I can gauge what they're doing wrong and guide them in the right direction.