Usually i carefully read the whitepaper and check who's on advisors list and the dev team
This is wise, however I'd also recommend looking at the 'industry' a project is looking to break into, and whether there is a need or opportunity for a project to get corporate/governmental backing.
I say it all the time, but it is the projects which will be able to transition into the mainstream and work with corporates and governments that will survive when all is said and done