I don't enjoy seeing abuse among couples.
I agree with you that after season 6 it became a repetitive cycle if SueEllen loves JR, JR cheats, SE finds out and falls off the wagon, they eventually make up, SE gets defensive anytime someone criticizes JR JR cheats, etc., etc., etc.
The fascination prior to that came from seeing SE gather strength, battle her demons, and stand up to JR. Also, seeing the layers of JR in that he loved power, but did have feelings for SE. After SE had her accident in season 6, JR speaks to her in her room. He seemed genuinely contrite for his role in this. Great acting and great chemistry between LH and LG.