There are too many ICOs this year, we had already over thousand of cryptocurrencies existed and there are more to come by next year and so on. That's why the uniqueness of an ICO is very important because not all ICOs will have a good future and sone of them are trolls and scams.
When ICO features and scalability that are already found in some early ICOs that's already gained support is the only advantage otherwise they'll not succeed.

The main thing what i see is wthether ICO is product based or not , thats where the ICO becomes more tricky. I also see their whitepaper thoroughly looking for their vision and business model. Until and unless there is no business plan i would not suggest anybody to invest. JUst look for their achievements in the future if holding long and take call based on the performance. I would still see the ICO a good part of the orgnisations that want to achieve something.