You know ICOs are all very individual right? You have to do more research to understand if an ICO offers good value because there isn't already a market for their tokens to give you some signal (which are already not great signals). If you find an ICO you understand well (its in an area you know) that sounds good go for it. You may also know people who have insight into some ICOs and could give you tips.
However, the days of investing in ICOs at random and doubling your money are probably over.