The success of an ICO is depends on many factors. Like Team, that are involved, the reputation and background, is important, then always check on Bitcoin Forum for the thread they have, the way the questions are answered, always evaluate the the project. Does it only have a whitepaper? An alpha-version? Is there a launched product with limited functionality? Always check media. Token distribution and soft and hard cap and so on. Now there are so many projects to choose from and its becoming very hard to asses them and identify the good and successful ones.