In my experience here in forum, one thing I noticed about promising projects is the way they make their Advertisements. Usually the ones who managed by reliable devs will make your bounty campaign experience more worth it and it is easily to identify by just following them through social media sites.

As of now I only have 2 projects in my profile, first is WePower, second is Vestarin and I have a good grasp on these two projects until the end of this year. It takes a lot of research before you could convince yourself on whether a certain project is good or just a waste of time.