I don't know if I hate anything about porn (hate is a strong word).
I suppose I could say that I am opposed to exploitation, and thus by extension, I hate the exploitative aspect to pornography.
As far as the medium itself, however, I probably only have minor pet peeves that speak more to my personal preferences than to the actual porn.
1.) If you don't know how to talk dirty, please shut the fuck up. I don't like it when people accidentally say the dumbest things to each other when they are all hot and bothered. If you are too worked up to string a coherent sentence together, just use body language.
2.) Better editing. The people complaining about blow jobs taking too long, and unappealing close-ups, and overall terrible camera work, are absolutely right. I'm not saying it has to win an Oscar for Best Cinematography . . . but Christ: at least make it watchable.
3.) Better performers. I dislike when the people I am watching are obviously not at all interested in the sex they are having. It's even worse when the performers are faking it. I am not interested in being bullshitted while I jack off. I have been to the mountaintop, and I have seen the light (meaning I am a Chloe Nicole fan). If you, as a performer, don't obviously enjoy the sex you are having, the scene is pointless.
4.) Better chemistry. When two performers display a special spark between them, it's magic. When that spark is not there, however, the performance is for shit. Maybe the performers need to get together and hangout the night before, or something. Nothing is worse than watching two total strangers who have barely ever communicated before, attempt to get it on, on camera. It feels less like fantasy, and more like exploitation.