well it is very difficult to distinguish which ico is true and ico is a scam, but the easiest way to see which ico is good is look at ico bench and ico holder because there has been filtered and there is a rating of the ico
That's unfortunately not true. They are not filtering anything.. Its very easy to get a high rating on ICObench, only thru paid advisors and people from ICObench. They have a pretty big community.
The only thing how to check if the ICO is a scam or not is to check their White Paper, Team and MVP if there is any.
This is pretty nice article about what to check about certain ICO.
https://www.linkedin.com/pulse/what-makes-good-ico-bartosz-navarra/I would never put my money into a project based on any ratings..