[Johnny]

The idiom I'm going to talk about is:
It never rains but it pours.

The English explanation is similar as when things go wrong, they are very wrong.

It sounds that it's something bad or derogatory.

I checked some Chinese websites and found that some explanations(Chinese idioms too) are something as follows:
1: mishap never comes single
2: Someone who appears ordinary, but he would become extraordinary(exceptional or phenomenal) when he shows his true color. It means someone is very good, has a lot of potential.

My question is can I describe people or things good by using this Idiom? I mean It never rains but it pours.