Just out of curiosity, what would a "good raid leader" use as a gauge for telling who is pulling their weight? Why would any "good raid leader" completely ignore a quantifiable unbiased metric if it were at their disposal? I mean... if raider A and raider B both are equally prepared for a raid, execute the fights flawlessly and strive for min/maxing their gearsets - then they would appear to be equal in your eyes. However, raider B is absolutely dead last when you take a look at the meters because his uptime % on the boss is abysmal and his rotation is way our of whack.
I don't get why meters are always an eyesore for some members of the raiding community - it is merely a tool. When used properly it can only benefit the raid group, and when competition is introduced, it actually makes people try harder than they normally would.