In principle, nothing wrong with it. But so much of it is just so shoddy that it fails to be arousing on every level. Even on those YouTube-style porn repositories, the vast majority of them are lame, with some jerk cracking stupid jokes and moaning clichés throughout the whole thing. "Professional" pornography is even worse, I've never enjoyed any of that. Hentai can be sexy (All that stuff that could never happen in real life? Well, what's fantasy for?), but there's a lot of borderline child porn in hentai that makes me really uncomfortable, and I try to avoid hentai to avoid stumbling across that kind of thing. Plus, guro is just horrible.
As to the misogyny thing - it depends on what kind of porn it is. Apparently, it's been found that non-violent pornography does not promote misogynistic beliefs, only violent pornography (as well as violent non-pornography). To quote a paper I was reading:
"According to two researchers, whose studies were ?cited throughout the two-volume work,? the large government study condemned pornography, but failed to reveal that violent content, rather than explicit sexual content, was shown to have a greater impact on adult males? attitudes toward rape and sexual aggression (Donnerstein and Linz). In controlled studies, males who were shown pornographic sex without violence had more *negative* attitudes toward rape than males who were shown violence without sex."
(full text here: http://www.frankwbaker.com/MediaLitEd.pdf)
I've never really bought into the notion that explicit pictures of a couple having sex automatically contribute to viewers seeing women as objects. I feel that argument applies more appropriately to hardcore BSDM videos (with female subs and male doms, of course, which is actually rarer than the opposite), "violent sex" videos, guro hentai and similar things; though I don't think that kind of pornography has the same effect on everyone, either, and pornography is never a primary factor in a person's behavior unless it is a primary element in their life.
But if it's the kind of sex that happens every day in hundreds of bedrooms in every major city, I can't imagine how it would have a serious impact on a person, unless they consume insane amounts of the stuff. And that would still be meaningless - insane amounts of *anything* can distort your thoughts. There was a time I played so much Minecraft I started perceiving the buildings and ground around me in blocks. That doesn't mean it makes sense to say Minecraft destroys your ability for spatial reasoning or perceiving non-Euclidean geometry.