Read their whitepaper!
What is written in the whitepaper and roadmap, often does not correspond to what happens after ICO.
Therefore, there is only one answer to the question "How to know which coins are good?".
Only Luck.
If the team is good, it means success.
No, it is not the right thing to do. I mean even the project is manage by good teams still the success is undefined because it could be defined at the end of ICO.