10 - Masterpiece. A show that fits all of the following criteria: a) technically and artistically competent - good directing, intelligent writing, great art and music; b) thought-provoking - literally, makes you want to think about what you saw; c) unique - offers something most other works of fiction don’t; d) huge rewatch value - can be watched 3+ times and remain fun.
9 - Great. Basically a show that lacks some of the qualities of the masterpiece, but is good otherwise. No serious flaws. Mandatory high rewatch value.
8 - Good. A show that is “generic”, or uninspiring, or flawed, but enjoyable otherwise. Low rewatch value. Shows that could’ve been a masterpiece but have some unignorable flaws also go here.
7 - Fine. Timekiller - you don’t regret watching it, but you’ll forget it once it’s over. No rewatch value.
6 - Guilty pleasure. Objectively it’s garbage, but there is at least some aspect that is interesting and worth watching for.
5 - Mediocre. Maybe not actively bad, but not fun enough to justify spending time on it instead of on one of the hundreds of better shows in existence.
4 - Bad. Serious flaws that ruin enjoyment. Something you drop without finishing.
3 - Terrible. Immersion-breaking flaws that ruin your ability to care. Something you drop in the middle of an episode.
2 - Unwatchable. Literally - it’s so bad it’s physically impossible to watch it.
1 - Crime against humanity. Morally or intellectually insulting. Whoever is responsible for it needs to figuratively get shot.