Altcoins cannot be termed as useless. They have helped people awareness. Every Altcoin has a lively community contributing to the overall cryptocurrency market. Useless Altcoins would vanish off the market sooner or later. There are some Altcoins which perform against the Bitcoin usually.
I agree , there are many good altcoins , just need to monitor those who are developing very well , I think there's a great future to earn tembolee if you look at the eos tron xlm eth