When I choose bounty campaign I look always from the ICO's rating site it's very helpful to me and other hand I look for the trusted bounty manager that has a good reputation in handling bounty campaign programs.
Don't trust ratings, they're just being paid and not to mention on how they easily rate the icos. It sucks.
I chose to join the ICO bounty, before I actually joined the bounty, I checked the website, whitepaper about their sales, the achievement of the Soft cap of a project will signal the project will be successful.
Good bounty managers are handled by managers who are experienced with a lot of trust. But not all famous managers will bring a successful project.
Sofcap can be a determinant if the project will continue ot not since some icos abandoned the project when it didn't reach the softcap.
While bounty managers are the one who just manage the bounty thus don't blame them if the ico didn't succeed, though the fact that some managers were just easily accept the bounty campaign without any research, as long as they've been paid then it's good.