How plausible is an Alcubierre drive, really?

Like on a scale of one to ten, how plausible are Alcubierre drives in terms of our current understanding of physics? Plausible enough to be considered "hard sci-fi", or are they just another form of handwave like hyperspace?

This isn't asking about how the science behind the Alcubierre drive works (except as needed for other parts of an answer). Rather, it is about whether and how an Alcubierre drive can work in a hard-science level fiction work.

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How plausible is an Alcubierre drive, really?

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