Most people would recommend:
1. Reading the whitepaper
2. Checking the professional profiles (LinkedIn) of the team
3. Checking social media for any relevant news
I have read also that large ICO % bonuses or very large overall bounty campaigns can be a sign that the ICO is a scam. If it looks too good to be true.....you know what they say.
Do you know any website doing good review on icos? At least it helps when doing reserch.
I'm sure there are some good ones out there. The thing with crypto is that there is so much false information and rumors being spread its hard to know who to trust sometimes. I always wonder what kind of agenda a crypto review site may have when giving a positive review of an ICO. Is it possible they are getting kick backs from the ICO?
The information revolving around the internet affects the coin prices so much....in the end you'll either have to rely on someone you think its trustworthy or do the fact digging yourself. I am sometimes guilty of just wanting profit instead of doing actual research, its so easy to get caught up in the mania of crypto.