I am checking it at
www.icoguide.com they have really realistic rates, and then when I choose several good high scored ideas I look closer at whitepaper, idea is very improtant, it should not be copied, team should be dedicated, involved with experience.
I am also checking the projects there, very good platform, but as you mentioned it is the first step, them comes other criteria, I would add activities in social media and telegram, through the activities you would be able to see whether team is involved and dedicated enough.