I think everyone is just missing the point that you're a random and don't know your skill level. But instead, everyone is turning it into a "class war". Hunters can complete the raid just fine, obviously. But if they didn't know how good you are then they probably needed someone that could shield or rez themselves, cause they didn't know what they were getting. It's also my understanding that you don't need 6 Titans and/or Warlocks to cheese the bosses. So this argument seems invalid to me if that is in fact what they were trying to do.