Look at their social media and threads here if they are active, look at team, look at road map how detailed it is. These are the features which should be taken into consideration at first sight.
Just to add to this. For me I think a good ICO should have a ANN thread on Bitcointalk and a subReddit page. This is where they get critiqued and queried real hard and the professionals will ask the team pertinent questions about the project. An ICO without these will look shady to me.