ICO is half dead! There are still many ico that is successful nowadays. I think its because of ico are so many and very crowded in the ecosystem that's why there are many ico not successful in their fund raising. We know for sure that a crowded market makes investors confuse on the right project to chose.
The problem was that basically investing in any ICOs in 2017 predominantly led to returns. There was an interesting statistic that I read from VC Mangrove capital that said that there was an average +13.2x return for investors for ICO had investors blindly invested in every on to date, including those that failed. There was an obvious bubble around these new crowdfunding mechanisms and people just threw their money at projects without even reading whitepapers
I don't know how interesting it is to know what portion of ICOs are scams or not but I think it is better to learn about what kind of problems are being solved by [Suspicious link removed]panies and then invest based on what solutions future/existing companies have. Sorry if I responded differently to the question you ask but I believe maybe you asked this because you are not sure about the market as a whole. I'm not saying that I am either but perhaps my answer will give you extra info (perhaps not :p).