I play as a hunter I dont think they are useless in the raid. When it comes to the gatekeeper portals if you hit the gatekeepers in the portal with the shield special then the hunters golden gun they are dead in literally seconds meaning there is less time your team mates have to defend the sync place. However the best class for vog I would say is the titan. Yes the warlock can self revive but that just means he makes up for his mistake of dying. The defender can protect and buff your teammates making the best class for vog considering the warlock is only useful if the warlock dies
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ummm to be honest sunsinger with solar or firebolt grenades even before you die on hard mode is useful solar grenade is used like a deffensive barrier from minotaurs they dont try run through it and punch you maybe you should learn some different techniques if theres a will theres a way i find all 3 classes useful you just feel the need to bash some 1 elses class because some 1 bashed yours just makes you a sheep following what every 1 else is doing.
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No the self revive is useful don't get me wrong especially if its like they are the last on alive but when everyone keeps saying it is the best class for vog and it isn't you can get through the raid without a warlock or a hunter (which is my class) but it's -blam!-ing difficult doing it without a defender