Me and Void did Mythic on full Hunters. Was surprised by how difficult it was for just being mythic but they did raise the difficulty of mythic in general.

1st boss, always seems to cast the instant kill ability on my main so I use turtle on just that one prior to it hitting. For the second cast I pop turtle on the remaining hunters, you can see from his target of target who its going on but it's too quick for reflexes.
Throw down some slow and freeze traps for the lashers that pop out and stay mobile as some of them explode. Going full DPS mode and popping lust was able to drop him before it got out of hand.

2nd boss, same as Agent mentioned, for hunters move the one about to get charged out of the way and pop a turtle.

3rd boss, I worked down the elemental adds that were doing some kind of mega cast. I didn't let them get it off to see what happened but can only assume it would be bad. Also used as much burst as possible. Tried to trap the melee adds while focusing on the boss. They seemed to come out when boss was sub 25% for me. (though it is based off time not health) it was just more advantageous to burn the boss down.

4th boss, ran into some issues when the fight shifts to illidan - I read it was bugged potentially for some. Either way, spread out your characters and go full dps. I popped a potion, lusted and got him down before phase 1 ended.
I was getting upgrades on a lot of these bosses so the difficulty vs reward is definitely there.


Void did down them all before me!! but his advice to me was burn them all, and that's what worked. Because that's 5 hunters for you