My rating is purely subjective:

6 - I didn't like it - 

More like: Why did I watch it??? I just really didn't get it.

7 - Could have been better -

Dramas/movies which I would loved to like but I just didn't. Frustrating when they have potential but don't live up to it.

8 - It was entertaining -

For me the dramas/movies start with this rating and by the end get their final rating. So which get 8 are the pieces that weren't bad enough to hate and weren't good enough to love but not a waste of time.

9 - I liked it -

Dramas/movies which was really good except for 1-2 characters/scenes/actions/plot twists.

10 - I loved it -

I fairly easily give 10, the drama/movie 'just' have to move me. If I feel for the characters and like the plot, I'll give it a 10. Actually I really love when the characters have good friendships, so if they portray it believable then I likely give good rating regardless of the shortcomings.