Yes, I did read Lean In. My takeaways (I should re-read it, been a few years), were some really handy advice on how to work around the impossible double-bind of women not asking for raises therefore not getting them, but then being penalised for being cheeky bitches if they do ask for them. That you shouldn't feel guilty about going for promotion before TTC, while TTC, or having conceived, if you want to. But that it's also fine if you don't want to.
And that people will believe the signals you give them - if all your body language is telling people "I don't deserve to be here" then they literally won't see you. Yes, sitting at the table might still get you ignored/shot down in flames. But I just do not get equating normal levels of assertiveness with masculinity. I am not a man.
Agreed that it's a feminist self-help book about how women can get on at work. I don't think there's anything wrong with that, and I don't really get how Dawn Foster thinks it's equivalent to cutting benefits for women who dare to have a third child without being raped. Other than that taking potshots at prominent women gets you a lot of publicity because publishers love a catfight. 
I do think that there is a lot of very practical advice that helps women to work around the root causes of why women are held back at work, rather than running full tilt into them. Yes, the root causes need to be called out as what they are and there is a very important role for people who do that loud and clear. (But I'd prefer if they did it without focusing all their attacks on women first and foremost.)
But if you're sat in a management meeting, there are ways that you can walk out of the meeting with better conditions for parents in your company, and women in your company, and there are ways that you can walk out with nothing, but with everybody feeling hurt and accused. Politically, I'm in favour of calling it as it is. Practically, when it comes down to direct action, sitting at the table and knowing how the dynamics work, knowing what will get shut down as unconstructive, what will go whistling over people's heads, knowing what will reframe the whole discussion in a way that has the senior guys in the room saying "well of COURSE we can't do that - it would be unfair!".
That's much more "corporate", but it actually directly affects women's lives. (And I felt fucking good about it. Sorry for being unspecific, but massively outing. A minor victory on the grand scale of things, I'm not senior, but it was something I could do and did. So, there you go. Lean In made some women's lives better, and they weren't rich or high flying super senior executives.)