Aside from them having no use cases...
* Price of one token will automatically decrease when there's a flood of free tokens getting into markets and scarcity of the token decreases.
(....)
This is not only the basis, you should consider a lot of things not only how their token economics works.
This token economics is just a part of identifying how good altcoin but this is still important though, you should identify it first.
There are some projects that their supply is quite low or decreasing or limited, but on some part of their project is not good like no use cases or product, it's still useless.