In my opinion, it will be very difficult to determine a good ICO. But if you rely on certain criteria, you can approximately know wether this is a worthy project. You can pay attention to the design of the site, the idea that it was unique and unique in its kind, the number of tokens that they release on te market, capitalization, the team.
It's definitely difficult to detect the right ICO. But it's still possible. There is a number of ICO tracking and analyzing resources like IcoDrops, IcoBench, IcoBox that can give you additional information about upcoming and active ICOs.