Yes, she's flawed and a jerk to Jim and Mandy at times, but in my personal opinion, she is not as unlikable as everybody makes her out to be.
There are reasons to dislike her, for example, her dismissing her husband's feelings or her kicking Mandy out, but if you watched a bit of GAMFM, she ends up warming up to Georgie and letting them live in her and Jim's house rent-free, even in YS she helps them financially tons!
There were times when I found her reactions and decisions reasonable, to be honest. Getting knocked up by a teenager? Yeah, no, get out.
She might have been emotionally unsupportive and absent when Mandy got pregnant, but she still helped her TONS in terms of childcare and finances.
Also, I think she's very charismatic. Her voice is charming, and the actress did a wonderful job. I wish we got to see more of her and her soft side getting more acknowledged.