i think it's not so easy to find the ICO which will meet all the requirements to be a promising one. as for me, the most important thing is token usability. nobody will invest in a project with no product or service, because token should be in demand, like in marketplaces or smth like this.
Marketplace is a good example. I personally own MTRC tokens to use via their platform. That kind of tokens will always be in demand as long as the market functions.