Concerning my anime scoring (Based on my taste through the years):
10: This anime/manga has everything i'm looking for. Even if it lacks in some parts, some made up for it. (Personally, there's nothing too perfect.)
9: An anime/manga that even though it's amazing it still lacks something.
8: Manages to be really good, however it falls behind in certain aspects.
7: Still decent but disappoints. Worth watching/reading if there's nothing else to do.
From here on, i would rarely recommend this:
6: Falls under cliché, unoriginal. Saved by little details but you can still live to watch/read this.
5: Uninteresting and boring. You've seen/read this too many times.
4: A pain to watch/read.
3: If it wasn't painful enough, i'm contemplating quitting. Rage ensues.
2: There better be something hilarious at one point if you're trying to read/watch this.
1: Don't even try watching/reading this. I sacrificed for you.
I tend to never drop an anime. So far doing good and regretting starting some anime (but will never drop, just pretend they're on hold).
About my manga list:
Reading manga: i'll put here any manga that has an actual end set.
On Hold manga: Putting here every manga that still is getting published.
Dropped manga: I'm actually putting here any manga that is On-hiatus.