I.
There is nothing wrong with having a strong opinion. There is nothing wrong with writing a pointedly subjective review. In many ways, fiction is often more interesting to read–and sometimes more truthful, or enlightening–than non-fiction, because we tend to lower our guard around imaginary things that we expect can’t hurt us. (Consider the great psuedo-essay, The Lifespan of a Fact.) But none of this detracts from the power of a fact, but while you’re always entitled to that gut opinion, to your personal viewpoint, these things do not trump a fact.

II.
There are some who argue that facts change as technology evolves and provides greater insight, so by all means, take axioms such as gravity with a grain of salt, if that helps you to get through the day. (Personally, I’d think disputing gravity would make it harder to get through the day, but I suppose life in…