Altcoins are a general term for every cryptocurrency excluding Bitcoin and it's not a good idea to generalize the experience in a particular coin to all of them. It's like being sent an inferior product by an instagram shop and calling the whole online business worthless and scam.
There are coins that die, are scam, don't work, can't keep up competition. That's why investors needs to be cautious and attentive when choosing a coin. They should build a diverse portfolio that includes different genres of coins. They should also occasionally reanalyze and readjust their holdings.