The story is not light, it is hard and painful. The characters are well-written and their decisions make sense. They make mistakes according to their personality and they interact with other people in believable ways.
The writers should have more courage and not try to downplay everything in the last 2 episodes, but overall the writing was solid. The ending didn't impress me, but it was believable and logical according to the story development.
The actors were good and the production was good, nothing too cheap nothing too flashy.