Choosing potential ICO is not that simple to do because we cannot determine what is the best ICO and all we only have is a guess and speculations. But at least we check its popularity in the telegram and some of good ICO also are being published in the social media. You must to check also if they have a whitepaper and website.
You might have a point in this matter, finding a good ico you must check first the whitepaper, the team behind it, the campaign managers reputations and the developer must be active most of the time on the telegram, Facebook and twitter. So if they are all active as the said above it means that project is good and legit.