What makes a bounty manager better? It's not about the success of the projects they introduce, it's about
1. How the handle the campaign
2. It's about fulfilling what was promised to bounty hunters
3. It's about fighting the fair fights for bounty hunters
The success of a bounty project is not in the hand of a bounty manager, the ball is in your courts, you are responsible for the bounty projects you choose, if they fail it's never bounty managers fault. Always remember this.
You have found it right but can't just blame BM of what it happens to the campaign because they are also relying on the project developers. However, it is big factor that BM how will run the campaign and how they care for their participants.
We can't deny that even reputed Bounty Managers are carefull in choosing bounty offering but its like to see that they can't make it perfect and all will run smoothly. And that makes them sounded harsh when people put a blame with them because in the first place, they don't want it to happen. It is the project owners who have a huge control.