I don't rate shows with a total runtime of <1 hour or an episode duration of <15 minutes unless they are part of a larger series or I really liked them. I don't write reviews for shows with a runtime of less than 2 hours except in rare cases. This includes most movies, OVA, shorts, etc. I write long notes on most shows I score, even if I don't do a review.
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General rating scale:
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Spoiler, click to view10 = Flawless in my eyes, has minor flaws I'm willing to ignore, or had a strong impact on me 9 = Incredible, but not to the level of the 10s 8 = Very good, minor but noticeable flaws 7 = Enjoyable with either a major flaw or multiple minor flaws (good plot w/poor animation, good plot but flat characters, etc.) 5-6 = Tolerable with significant flaws, major improvements could have been made 3-4 = Usually has a horrible plot and/or characters, low enjoyment rating, but at the very least tolerable visuals and audio 1-2 = All around bad in every category: shit story, bad characters, low quality visuals/audio, enjoyment rating so low its practically nonexistent, i.e. the worst thing I've ever seen