David Brothers at Superhero Alliance has a meditation on the sexualization of superheroines in comic book art. His objection is not just political; he points out that it makes for bad storytelling.
Whatever the reason, we're mired in crappy sexualization. And the problem isn't just what that means for women, but what it means for the craft and quality of the comic. Imagery that prizes sexualization above all else -- especially when that doesn't make sense for the story -- can pull you out of the moment and stop your reading experience dead.
Cape comics exist to tell stories. There are a variety of stories they can tell, from mysteries to sci-fi to cheesecake to drama to existential examinations. The problem is when the streams cross to detrimental effect. In certain proportions, mixing those stories is fascinating. It's when things get out of proportion, when things turn grotesque, that the entire enterprise begins to fall apart.
The art examples he shows make the point very well.