I meant to write this a while ago, but, y'know... stuff.
Since I delayed, I no longer can find (well, not with just the energy I care to spare) the WFA-linked blog post where someone idly wondered why there weren't more feminist comments regarding Adam Warren's series, Empowered.
As someone who's read not only Empowered, but a lot of Warren's other work, I may be able to provide an answer, of sorts.
Part of the reason, as has been pointed out elsewhere, is that while Empowered does indeed trade in cheesecake and bondage, which you think might tweak a bunch of the fangirl feminists, the characters are complex, multi-layered, and engaging, even when they're clad in skintight spandex and trussed up in rope. Titillating, sure, but that's not the only thing going for the story. Therefore, you could surmise that whatever faults a feminist might find with the series would be mitigated by the feminist-positive elements.
[Depending, of course, on the feminist, no hive mind, your mileage may vary, etc. I remember reading an exchange between him and a visitor to his DeviantArt page who was absolutely convinced that a woman who had captured Emp in the first book had finger-raped her; despite Warren's claims that no such thing had taken place, the gal leaving comments rejected the direct word of the author and artist to insist that it had happened and that Emp's proper reaction would be to become a shattered wreck after the incident. Disclaimer: It's been a while, I may have some of the exact details wrong. Still, I think the gist is right.]
Now, I confess this is pure speculation on my part, but I submit to anyone bothering to read this far that the other main reason that Empowered hasn't been causing more fuss is that, either consciously or unconsciously, comics feminists realize that what they say and think probably isn't going to have any effect at all on the way Adam Warren makes his comics in the future. Which doesn't mean I think Warren is sitting around going "screw you, feminists!" as he draws Empowered, but that he's secure enough in his own mind that appeasing feminists or any other group would rank low on his list of priorities.
He's not Marvel or DC, after all. You can't say he's making comics that kids might read, because they're pretty clearly aimed at adults. His publisher Dark Horse is not likely to cave in under pressure, as they're the ones making an effort to reprint John Norman's Gor novels (how's that going, I wonder? Haven't heard much lately). A lot of the arguments you might use to try and sway the mainstream publishers lose their bite in his case. Mostly what you have left, then, is the idea that drawing bondage and objectifying cheesecake is morally wrong on the face of it, and I don't think Warren shares that view.
Warren, it should be noted, didn't start drawing cheesecake and bondage with Empowered. The series itself, he claims, arose when he was doing those themes in commissioned artwork, so that's a sign he has no moral compunction against that kind of material. That, and the fact that he's worked it in to a number of his other projects, like The Dirty Pair books and Gen13.
Years ago I saw Jon Stewart on one of the late night talk shows (Leno or Letterman , I can't remember), and the topic of George W. Bush's then-fresh search for Weapons of Mass Destruction in Iraq came up. To paraphrase Stewart's statement:
"Oh, I don't think Bush'll be embarrassed if no WMDs are found. Someone'll say, 'Sir, there's no WMDs in Iraq, never were', and he'll go, 'Huh. How about that," and go back to whatever he was doing..."
I could see it, if someone was raging at Adam Warren, complaining about his comics. "This is sexist!"
"Huh. How about that."
It's difficult to shame someone into changing when they don't feel the shame you think they should.