Quintin’s review published on Letterboxd:
Imagine you're a fifth year Slytherin student at Hogwarts. You're the only child from your parents and want to make them really proud as you expand your knowledge on the wizarding world. You stay after classes to practice advanced spells for a fifth year student and you don't attend Quidditch games because you stay in your dorm studying before your OWLs. You get little moments of appreciation when Professor Snape give you 10 points for completing an elaborate potion or 10 points from Professor Quirell for conjuring up a complicated curse; however, the real moment of victory is when they give you 20 points for getting an extraordinary score on your OWLs. The year is at an end. You're at the Great Hall with the Slytherin banners surrounding the room, you know after a long year of doing everything you can, you earned your house at least 100 of the 472 victorious points. The green banners behind you as a reminder of your hardwork paying off... then Dumbledore stands up and rewards three first year students from Gryffindor 50 points each for breaking their curfew which gives them the win. Dumbledore then makes a joke that these banners need to be updated because these green banners are from some losers. A simple wand shake turns all the banners red.
No wonder Slytherin hates Gryffindor.