Yes, I know. She's overbearing at times, and smothering and she has a crush on Lockhart (but so did Hermione, and his Doxycide seems to have worked)and she seems to have decided to spend her life worrying over her children. I can see all of that plainly.
And she does seem to spend a lot of book 5 cooking and cleaning - or leading cleaning parties. Except that she wasn't just cleaning - a few good scourgifies and the occasional evanesco would probaby have taken care of that. We have some idea that she is powerful - we've seen her manage several magical jobs at the same time. Yes, women multitask, but that's still an idication of power.
What Molly was doing extermination - she was ridding Grimmauld Pl of the pests and dark creatures that had colonized it since at least Mrs. Black's death. And she was clearly in charge of a major project, Sirius' desire to discard all his heritage notwithstanding. That's not only skilled work, it also carries some danger. We don't know what because Molly being Molly would have tackled the most dangerous as soon as possible.
And she does have other duties - she's been on guard duty, for example. We don't know what else she's up to. Honestly, we have no idea what Lupin is doing, either.
Meanwhile, she's raised seven children, and even managed to keep the twins alive and in school until they chose to leave(if any pair were going to violate the no magic during the summer rule, it would be them. Although I suspect they'd get away with it - I suspect anyone in a Wizarding household would.) That she's chosen to stay at home even after her youngest is in school all year - that's up to her, isn't it? She's been out of the workforce for a number of years, and we know that jobs in the wizarding world seem to be limited. She'd end up doing the sort of the job I'm doing.
On a side note - I'm wondering about her clock. Dumbledore refers to it as "that excellent clock of hers" which is an odd phrasing - you'd think that most families would have similar ones, given how useful it would be, but the implication is that it's special to her.
Which makes me wonder if maybe Molly's clock is unique - and is hers. Maybe she made the very interesting clocks in her house, the ones that give useful information instead of time. However, they'd be one offs and not easy to create. I'm not sure where the wizarding world is with mass production. Given their small numbers, they may not need it.
Or maybe she sells them, too. Maybe she's where the Twins get their creativity. Actually, I can see that. She could well be a reformed troublemaker - which is why she understands her sons so very well, but like many a reformed person, is a little self-righteous and evangelical about it.
She's also probably not a little overwhelmed by class differences. Britpickers have said that Arthur is of a higher social class than Molly, and she knows it. His family might well have disapproved of Molly Prewett - her speech, her manners, her mode of dress - everything but her blood and her hair. However, it's clear he loves and needs her as she does him, and that is what counts.
If she comes from a family of craftsmen instead of professionals, that might well be. To her credit, she doesn't try to be someone she's not, but she also has to be aware that she may have held Arthur back in his career. She's just not the society hostess a politician or rising civil servant needs. For all we know, his family might have cut him off for marrying her, which is why they're poor. I actually doubt that - class and wealth do not correllate well.
This could also be why she's so worried about Bill's unconventional hair - maybe it's a class thing? And Molly's tied into her social class enough that a young man with hair that long is sloppy and presumptuous at the same time?
Anyway, she's clearly a more complex character than she appears to be, even if you discount my little extrapolations. I like her. And I love her because I know she'd have taken Harry to her heart even if he hadn't been famous, just because he needed her. Unlike a certain aunt of his.