I'm a lvl 30 Hunter and these don't apply on the Hard raid. However, where Hunters are extremely valuable on the Hard raid is on Supplicant duty. One Hunter should be designated as supplicant bitch while everybody else is shooting Atheon. Golden Gun will one-shot the supplicants and saves all the people in the middle from having to dodge supplicants while scrambling away from the center. If there is ever a lvl 29 Hunter in your group on Atheon, they HAVE to be the supplicant guy!! Very useful role for somebody who is a 29 on Hard. Any class can be competent with the relic. More to do with the user than the character. If I'm teleported to Venus on hard, if I'm not the one grabing the relic, I typically will use my 3 golden gun shots on the Praetorian then move on to taking down Oracles with my maxed Atheon's Epilogue. On Mars, I'll take some pot shots at the Hobgoblins so that they aren't shooting the relic holder before moving on to Oracles. All of the classes are good in their own way and you can clear the Vault on Hard with any class as long as you know what you are doing and have a good team dynamic with good communication. I'll also add that more important that what class you are is your weapon loadout. I was lucky with weapon drops a while ago and have maxed Atheon's Epilogue, Praedyth's Revenge and Gjallahorn.