Many scammers are using ethereum tokens and contracts to commit they fraudulent art. I think ethereum itself is good but most of the ICOs build on it are scams. I read online yesterday that 92% of all the Ethereum projects in 2016 and 2017 has failed. Most of the owners of the projects are just interested in defrauding investors and nothing more than that. However I am not seeing clash underway as we still have a long journey in cryptocurrency development.
This is left for you to do your research well to get you hands on the 8% successful ICOs according to your statistics. Besides, the whole crypto world is a risk. You didn't get an assurance policy and I guess every reasonable ICO has a disclaimer