Nowsaday, I don't think there is any ICO worth to invest anymore. I had so many bad ones lately. Better off purchase them after they released at the exchanges.
I think the problem with most of these ICOs is overvaluation, some people don't estimate what a project worth, no matter how good the prospect of a project might promised, once the project is overvalued the best thing is not to invest into it, that was why ICOs was dumping when listed on exchanges because they is no value in their current price. Just look at Lisk and Waves for example two over-capitalized projects but where unable to deliver to expectations and I see this trend continue for more time in the space because people seems to have forget the basic principle of trading, you buy at low price and sell high
After the ICO, the team will put focus on the development process, which take times, especially they are built from scratch. If you follow the process of Ethereum, you will know that.
Thats right after ICO ending need some time to investment to bring profitability and growth, just need wait and check roadmap project.