Every coin in history was called a scam by someone. I will just give you a few links to older threads that called some coins scam and you try to draw some conclusions from it...
This first thread about Ethereum being a scam is such a good laugh today. 

https://bitcointalk.org/index.php?topic=707237.0
https://bitcointalk.org/index.php?topic=1637318.0
https://bitcointalk.org/index.php?topic=448643.0