Hunters are fine, they kill enemies like any other class, but almost every one of your points is wrong. The blade dancer can clear out groups, but both the titan striker and warlock voidwalker do it faster and more efficiently. Titans are technically the best for holding the relic since they are built for melee, the extra armour means they can take more hits, speed is well and good, but you dont need to move far, so speed is not as necessary, the problem is that hunters are squishy, so it can be problematic. Your first point is fine in the case of the gun slinger, gunslinger is nice for quickly taking out 3 or 4 oracles (though your team should be able to handle killing oracles with their regular guns), but any of the vault primaries should be able to handle this job easily, with my vision of confluence i can clear out the oracles by my self (helpful if it only sends two by accident). I have no problems with hunters on my team, so long as you can shoot the enemy and dont constantly die, then i dont care what class you are.