I think the most important thing is to participate in the campaigns of bounty managers who do their job properly.
I don't see a famous manager now, for example sylon, Jamal, yahoo. I do not know whether they are retiring or not interested in becoming a manager.
many new managers, so it's difficult to set a good bounty based on the manager's criteria.
Exactly, now a days it is impossible to find the good bounty because there are new managers managing the bounty based on the rating given by the ICO listing website. So it is good to research ourselves before participating in a bounty campaign.