Haha, good thread! ^_^
The worst for me:
Ma-Juns mom (Kim tak gu) - i really loved her in some ways, somehow, you could kind of understand her reasons (even though she was bad). I think, she had this cold atmosphere, that created the certain feeling about the whole drama - maybe creepyness? Yeah, she was somehow creepy for me. I LOVED her last scene, when she stands alone in the hall, abaddoned by her husband and children and she says something like "I will not give up" or like that. That moment was so powerful. I loved it
mom from Cinderella sister - also very strong and powerful woman. It was kind of hard to understand her. I would say, that i have some kind of love/hate relationship with this character
mom from Shining Inheritance - OK, she was like a REAAAALLLYYY BIG BITCH. I just hated her, but somehow, she was not that interesting character like the two moms i mentioned before. Her character was not as deep as theirs, i did not fear her
mom of the main guy from Creating Destiny - just as much as i didnt like he whole drama, i didnt like that mother. SHE WAS SO STUPID! I really hate characters like this - they are not reasoning things, they act harshly just because some really stupid matters (and she was not the only elder, who acted stupidly in this drama). I know, that they needed someone, who would push the story, but she was written soooo badly, that it really pissed me of
Queen Seon Deok - Mishil - i know, that she was not technically the mom, but we can count her here, somehow. God that woman was amazing. Evel as hell, but amazing.
btw i usually dont remmember good moms, if they are not interesting, sorry. The only one i could remmember is Gumiho from Gumihos revege. I didnt see the whole drama, but i think she was very interesting character