The main reason people don't like it so much, is because, while it still is scripted per say, there is more randomness involved than most fights. Or maybe that is a poor way to put it... A better way might be to say there is more personal responsibility than most fights in this game.

Being responsible for yourself and playing a game with random people doesn't go over well... Say someone goofs up, they get called out, and they won't like it. Or maybe someone goofs up and it isn't clear who's fault it was, then argument ensues...

It doesn't ever even really matter who's fault something is, they just need to do their best yanno? But people don't want to be responsible, they want it to be like a single player game where no one notices...

That and Ramuh actually has quite a bit of a DPS check... And DPS meters are forbidden so, I bet people have no idea if they are dpsing correctly.

So yea, do a fight where you might get called out? Or try to get threat on a hunt mob for credit with like 150 other people... where no one can really judge you unless you pull early! :P