An active developer team is important, and you should check all of their profiles and credibility. Next, they should always try to respond to any doubts that you raise in their thread. Their site and design layout should be elegant, meaning they invest a bit in site building to attract their valuable customers.
The most important thing would be to read their whitepaper as all their information is their, find out their soft and hard cap. A good ICO would have good intentions and can contribute to the crypto world, if not the society and the world.
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
Take a look at
Verify and their
whitepaper for instance.