Also, I check their progress before they KO the ICO. I personally don't invest in ICOs which are big marketing bubbles and no work done. I personally don't like lazy teams which are waiting for money before spending energy on their idea.
Usually I go after ICOs which have a working prototype and they are proudly showing it off and are open to discuss it in their Slack / Reddit.

Monetha is an example of massive marketing, tons of Videos and posts, hundreds of social media pumping, a lot of theorising and handshaking and no presentable work done.