These days in think it's more simpler to figure out because some more professionals do help evaluate this projects.  There are a couple of bounty hunting websites that have come up to help u save time. Though one can still get scammed but the chances are lower if you make use of the reputable bounty hunting sites.  Bounty hives goes as far as collecting all the tokens that a project is willing to give out before helping the project to coordinate the bounty campaign so that there would not be stories at the end.  You can try it out