My ratings:

10 - Amazing! One of my all-time favorites!

9 - Great! One of my favorites, but maybe not in the top 5.

8 - Really good, with one or two minor flaws

7 - Good, with some really good (& not-so-good) parts/aspects

6 - Good, but nothing special

5 - Fine, neither good nor bad, middle of the road

4 - Eh, I finished it (maybe) but wouldn't recommend it to anyone

3 - Bad (I would normally quit watching something by this point)

2 - Really bad

1 - Horrible, so horrible it's kind of amazing