My worst investment till now has been in into OPUS. A bunch of school goers hired a freelancer and made an really impressive alpha which kinda hyped the ICO. Only if i was aware about the dev being a freelancer i would have saved my 10ETH. No updates at github since the end of ICO.
As much as I loved that OPUS idea, it was the team that messed it up and made me not to go ahead. After doing a lot of research, I noticed they had no huge experience and in as much as the project sounded good, I was not just comfortable leaving my funds with them and I guess I was right.
Noticed they are still in the market anyway without much development and the value has just been hovering for a while, but we can never really say, anything can still happen in future,which you might get lucky. So, you can still hold since I have seen so many projects like this before.