First, I would like to say that this mini-series is an adaptation. For people who don't like it, it's okay as most progressive societies have left such norms but the depiction of the abuse shown in the drama is very real in many countries. Salute to the author for daring to write it and the film studio for daring to show it as many societies still do have such issues.
Secondly, I agree that the story is extremely depressing, the pace is lacking (somewhere it was very slow and showed scenes that were not necessary and somewhere it completely skipped important details and scenes), the ending is totally BS (like what! especially how they just got together in the last minute) and there is absolutely no rewatch value. But it should not be judged purely on this basis. The actors did a great job in fulfilling their roles respectively. The soundtrack and music were also good for a short mini-series. The director did a splendid job on the project as well.

!! Spoiler Alert !!
Now I would do my best to explain some of the major issues that I believe are highlighted here:
1. The FL is very grateful to ML because of taking her in when she had no one to turn to. Thus becoming loyal to her (although this is wrong) in the process and accepting the abuse of ML. After all, he is the love of her life and she accepts and endures everything (again, this is wrong). You can feel the strong determination of ML when she says to her friend that she will make him fall in love with her.
2. Through the episodes we can see that ML starts to feel sorry for her (the scene when he eats what the FL had made for him, and also getting jealous when FL is with the other guy). This shows that ML wants to change but in my view, it is his pride that would not allow him to change how he treats her. You can see the conflict in his emotions when ML resigns and he signs it, and the same when she asks for the divorce and he accepts.
3. The nudge that made the FL take the bold steps of resigning and divorcing is due to help from her new friends. This shows how much good friendship is important and how it can give courage to a person to take that important step in life.

PS
I usually avoid writing reviews but seeing all the negative reviews I thought it necessary to write this. Now enough rambling from me but I do hope that people would understand how real such things are in many societies.