Melody

Hmm, good point. That didn't make it any less enjoyable for me though. I didn't think it was great but knowing how didn't really make a difference to me.

That's not a good argument against the quality of the story. Many things are left unexplained because that's not the direction the plot wanted to go in. The issue arises only when the viewer wanted an answer to that plot point, but I was satisfied without it.

If a story cannot explain the plot device that was used to drive the story, then it's poorly written and lazy.

It is impossible to be objectively satisfied with a story that refuses to explain a plot device then continues to use it over and over.