This is how I rate my dramas:

10 - Masterpiece: absolutely amazing
9 - Great: I loved it
8 - Very good: I liked it very much
7 - Good: I liked it
6 - Fine: it was okay but it didn't leave a lasting impression on me
5 - Average: neither particularly good nor particularly bad
4 - Bad: I didn't like it - there were significant issues
3 - Very bad: I disliked it very much - there were severe problems
2 - Horrible: I hated it
1 - Appalling: shockingly bad