Love the show.
I’d argue that Debra and Robert were quite likable on most episodes. Sure, they had their issues (Robert on the Raybert episode is at his lowest) but, overall, I thought they came across as consistently well-meaning people. Sure Debra could be mean to Ray but she was also in a very tough situation. Ray wasn’t ever vying for husband of the year and she had to deal with her in laws constantly while her own parents- who generally were very kind to Ray as well as his brother and parents- were dismissed and disrespected.
Marie could be absolutely atrocious at times. Frank was almost always a jerk, but he wore it on his sleeve. Marie it was a lot of passive aggression and subtle insults.
Not to mention Amy, who became a regular in the last few seasons, was likable.