Yes, ICO is still a promising way to invest in crypto world. There are successful ICOs in 2018 and there will be more in this 2018.
I am buying a lot of ETH and NEO to prepare for the ICO projects that I am going to invest. I think 2018 will be the trend of ICO projects because you can see that most of the coin after completion of selling tokens on the commercial sites have increased dramatically. That attracted many investors interested in ICO projects more, which is the opportunity for ICO projects this year.