It is very difficult to differentiate between scam projects and good one as the cryptocurrency market is annonymous and the bad people hide under this annoynimous nature to scam people.  You can find a project with a well written whitepaper but at the end of it, it remains an idea and the developers maybe out to scam people because he has no any intentions to developed the project out side investors money.  It is very risky to invest into any new project and my advice to people is to buy any coin and tokens after analyzing it performance in exchange and not through icos.