Autotune sounds different than non-autotune regardless of whether it's used by a good or bad singer. As a result, it can be used for creative purposes, even by good singers.

Drum machines sounds different from kits, which doesn't mean that drum machines are an inferior version of drum kits. They are different, and there's room for both.

Maybe you will never like any song with autotune in it. That's fine. But the idea of objectively "good at making music" leads to some nonsense. There's no accounting for taste.

In my opinion, the more music made, the better. There's something for everyone.