Read their white paper, look their partnerships to see the credibility of the project, and also their advisors. Next is look at the core team and the credentials, are they really fit into that specific project. Last is the project's advocacy and their mission and vision, do they aim to improve social issues? or are they just purely for profit. Look at the roadmap, where do they want to be in the next X year/s. Look at the technology what service are they providing, Is there really a demand for such service? are they implementing the right technology for their product/service etc.