The latest controversy in the comic world is that Milo Manara Spider-Woman cover, and it's absolutely something worth discussing. On the one hand, it was a bad idea to run a clearly sexual, male gaze-guided cover, on a comic with a female protagonist, that’s aimed at a female audience. On the other hand, this is exactly the sort of thing you hire Milo Manara for. He’s very good at erotic art and the cover isn't a bad piece of work by any means - it just doesn't belong on this comic.
If it were the cover for a book of erotic art, no one would be complaining. The problem here isn't the art itself, but the context, and that's the main issue to focus on. To paraphrase ComicsAlliance's Andrew Wheeler, you wouldn't put a spaceship on the cover of a crime story, so you shouldn't put an erotic artist on a mainstream superhero book.