There is no worst altcoins but worse altcoins, more and more shit altcoin is coming out to scam our money, so keep third eye on those projects.
Worst coins are those that never listed on the exchange for long time after the projects ended and now it is gone. There are many coins I had on my account but useless because I again d nothing from it even I work hard for it to have. Many scam projects but hopefully this following year projects become valuable.