I have tried investing in ICOs before. But then, this is the few tactics i employ anytime i wish to participate in a bounty project to support the ICO of a project.
1. I look out for the total number of tokens the wish to give out tot the public and the one the wish to keep for the dev team and the development of the project
2. Look out for the quantity of the token to ethereum equivalent
3. Double check the goal and mission of the project
4. The authenticity of the credential of the dev team