My only irritation is when I don't get decent enough credit for it because I didn't join a party because there was no room and credit seems to be based on how much damage /threat your group does. I was at an S rank and got like a piddling of rewards for it because there wasn't room in one of the groups.

There should be something in place that gives full rewards if you are fully engaged in the fight, not a tag and run thing, nor should you have to pray there's a spot in party. I haven't bothered with hunts since.