Personally, i just check 2 things.

First is if the coin has a unique and original innovation the solves a real world problem (there are already so many duplicate projects out there, why create a new one).

Second, and probably less important, i would check if they have a good marketing. They have to come out as a professional and competent team that is really out to do something and not just take investor money. If they can't even look good while promoting their coin chances are they're also not good at developing their coin.