My drama rating system:

10-9 => my favourites, perfect or almost perfect

8.5-7.5 => very good

7-5.5 => enjoyable but could've been better

5-4 => alright but there are quite a few things I really didn't like about them

3.5-1 => kinda forced myself to finish (but still liked something about them)

(I have no idea how to rate movies so I don't do that)