I have difficulty in understanding the word bastardization in this sentence that I took from a vocabulary-builder app:

The movie World War Z is a complete bastardization of the book with little more in common than zombies and a title.

Not only do I not understand the meaning of it, but also the usage of that word. By the way, the app gives the synonym 'corruption' and according to Wiktionary (the fifth definition), it means:

The creation of an inferior copy or version; corruption, degradation, or debasement.

It hasn't enlightened me about its meaning. If I make a correct guess, is it the same way to say, as if someone adapts the story of a film from a novel, but he changes the story drastically?

If so, can I use it like this:

Harry Potter franchise is an absolute bastardization of the original books!

I have difficulty understanding the word 'bastardization' in this sentence I took from a vocabulary-builder app:

The movie World War Z is a complete bastardization of the book with little more in common than zombies and a title.

Not only do I not understand the meaning of it, but also the usage of the word. By the way, the app gives the synonym 'corruption' and according to Wiktionary (the fifth definition), it means:

The creation of an inferior copy or version; corruption, degradation, or debasement.

It hasn't enlightened me about its meaning. If I make a correct guess, is it the same way to say, as if someone adapts the story of a film from a novel, but he changes the story drastically?

If so, can I use it like this:

The Harry Potter franchise is an absolute bastardization of the original books!