I think every aspect you have mentioned would play a part in determining if one should invest in an ICO or not. Another aspect you can include is the long term goal of the developers; how they plan to realize their objectives through the introduction and mobilization of their tokens; and the track record of the developer team. The manager can also be an indicator if the project is well-maintained because some manager are unfortunately using their knowledge to take advantage of people. If you are convinced with those factors, then go and take the plunge.