Iād like to see where you found the definition of 5/5
Perfect scores only mean perfect on something that cane be objectively scored as āperfectā for example 100% on a test would be perfect or 5/5 on a test would be perfect because you fulfilled a certain set of criteria.
You cannot put the same rules into something subjective as there is no criteria to meet. Itās more of a āhow much did I like this thingā anything external doesnāt matter. The rest of human achievements dont matter, if you LOVE something then you love it. It shouldnāt be put alongside anything else, really, you cant benchmark music. Itās impossible. So you shouldnāt try, it sucks all the enjoyment out of it to grade it analytically like that.