Would you like an in-game parser?

[RobbieH]

Astrologians won't be able to plan their party buffs on the higher DPS if they cannot see the groups DPS.

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.