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I don't expect science fiction to be a science textbook, but the author ought to understand science, and only depart from it when the story requires it. For example, faster than light travel may not be possible, but it's a necessary element if you're not going to have travel between stars take decades. If the author doesn't understand science, I put the book down. Similarly, I don't expect a historical fiction book to be a history textbook, but I expect the author knows history. I want a historical fiction book to have people, ideas and events that are plausible. Anachronism will get me to put down the book.
Of course, I'm not telling anyone else what to do.
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