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