I would like to say that the issue here are on the people. The hunt themselves is not ONLY the contributing factor here, but you also have to look at the players.

I once found an A rank in the Churning Mists, Bune. I shouted and a minute later, the stream of shouts came in. No PT was called. I didn't join it myself because I wanted to rush some MSQ but to my surprise, about 3 minutes later, there are still people coming in and they are being accepted. Silence came and someone shouted to see if anyone else on the way. There was no reply and they just pulled and killed in less than a minute.

Well to be fair, it was off-peak time so only the hardcore hunters were on as I saw some familiar faces. So in conclusion, it's not -totally- the hunts' fault or SE's fault, the hunters need to have a little tolerance is all.

As with any other people issue in the game, they are doing these things because it rewards them highly, despite their bad actions. Get rid of that reward and you'll get rid of the abusers.