If ICO give a lot of information about it - it's good. If the workteam have good reputation - it's very good. As example - Komodo from developers BitcoinDark or ArcBlock ICO, when you can see strong team also.
You can also check the team thoroughly. Are all real people in the team, are there any dummies or non-existent people. Are all really working on their specialty, and not just photos from the Internet.