I was discussing this with some friends earlier. One brought up the idea that as soon as someone comes within a certain amount of yalms of a hunt that a mark be placed on that particular hunt to make it invulnerable until about three to five minutes later to wait for everyone that wants to kill it to come in time. While people might complain, the spawn time in between all of the hunts are quite long and a few minutes of waiting should hardly matter.

Or make them harder to kill. It's pathetic how fast they drop right now. I expected more out of 3.0 hunt monsters myself.