ETH definitely is the best coins after bitcoin. Token uses ethereum platform to make their ICO, based on what do you think that ETH is a scam? from 2009 until now some peoples said that bitcoin is a scam, but look at now, how high the price of bitcoin and people start looking for many way to earn it.
Definetely No, Etheruem is never a scam, it is just there are way too many scammers that are making use of the ethereum technology on smart contract to create many tokens and try to lure some investors to invest into their ICOs project.