The way you write a review for any film or book is to use broad strokes. Don't go into the details. Instead, you want to give an outline of perhaps the first 1/4 or so of the piece.
Start Googling movie reviews for movies you've seen. NOT Good Burger
(why was that flick chosen, anyway? When I was in college, we used to watch Citizen
), and see how they do it. See how far into the plot they go. One thing you should notice is that a review is absolutely not a retelling of a piece. It is a broad outline, with the reviewer's opinion as to how well the dialog, actors, director, etc. get their message across. Does the plot flow smoothly and believably? Or do you lose suspension of disbelief halfway through? Do the actors have chemistry that's believable? Or is someone miscast?