It's not that hard
Just imagine that you are writing a post about the best/worst sex you ever had and you're trying to describe just what about it was/wasn't exciting to a friend of yours who might have a vague idea what it's about, but would like the juicy details.
And since so many here I imagine like porn on occasion, you go into details. Give them each thrust of the titillating (or not) narrative, the moans and groans of character interactions, and then top it off with hints of the (plot) climax.
What's so hard about that?
So...does help any of you struggling with your reviews to focus on how to relate your thoughts to others?