Would you like an in-game parser?

[JunseiKei]

Not entirely true, the Hate meter is a "hint" at who's doing more DPS, exception for openers (a bad DPS probably doesn't do a good opener to begin with) and if Quelling Strikes is used, even then if the hate bar on the other DPS is too small (exception for Monk due to being somewhat slow starters) don't use on them, or simply wait a bit before buffing people.

One thing is to check the gear, Raid Gear and/or Sophia weapon should indicate good players, still this doesn't mean they aren't bad, might be someone who got A12S weapon for a Job he doesn't play and is giving it a try.

In the end yes, for Astro is kinda hit and miss without parser.

This doesn't account for people who buy content from those that can carry in exchange for gil. Bards and Machinists tend to be high enmity generators, but tend to not have nearly as much DPS as a melee or caster. Even if someone is #4 on the enmity list, it doesn't tell you how high it is; or rather, how low it might actually be. Not even taking into account an off-tank that is holding at #2 on enmity.