Many ico was here in forum and i always read the comment/reply of others, they got a negative feedback for project for participant to have doubt in campaign, I know some of member always do that so it can less the user in campaign and they will gain more profit. I wonder specific info on how to investigate, Yah, We can predict if the project will be success or not by reading the update in thread but how specific we can do to check if its scam or not.
You just need to widen your research about the project as much as possible. The projects offering tokens in their ICOs are always looking good at first sight. No scam indication. But after a thorough research is done, the truth will come out. Go to their website and talk to the developers. Legit projects are always attended to.