I have a lot of the same complaints:
Music: Annoying music that gets in the way... it is rarely ever done right.
Sound Effects: I hate obvious dubbing.
Effeminate guys topping: The effeminate guy is having a hard time trying to lifting his partners legs in the air. This is more comical than sexy.
A two-some turn into a sudden threesome: The scene is going well when the director decides that a third person is needed, or a fourth, fifth. Sometimes mid-way through the scene when you are ready to pop. The result is another 20 minutes or more of foreplay, fucking and a sudden finish where dribbles of cum are expended.
Cutting between 2 or more scenes: The director juggling two sex scenes at the same time, this seldom works. Either one set of partners is hotter than the other, jumping between them is fucking annoying.
Lack of chemistry between the two performers: This is so crucial, the guys have to be into each other. They have to be willing to pleasure the other and make the scene sizzling hot. If you're two performers look bored, are in pain, or generally just uninterested in the partner or the idea of sex with a man.
Over-long focus on sucking cock/ass eating/kissing/piston-action: oral sex should be at least 2 to 3 minutes, no one's jaw muscles are that tolerant at sucking for that amount of time. Ass-eating, I don't mind this but if the receiver has an asshole that looks like something from Aliens or The Thing, NO FUCKING WAY! These scenes should be at least a minute long. Anything longer makes me wonder if the one performing the service is actually sampling the receivers previous lunch menu and or previous sex partners, eeww!
Kissing can be sexy if done right, I don't mind this but if its longer than 6 minutes, I lose interest. Piston-action, I love close ups, but I need to see the occasional long shot to see where we are at, 5 minutes or more of piston-action, I tune out.
Tans: I hate overly tanned performers, they are gross and sometimes comical. Zoidberg comes to mind! No overly orange, red, lobster people, or Ommpa Loompas.
Muscles: Some muscle men are hot but when I see veins everywhere, spider veining, coupled with over tanning, or over shaving. They cease to be normal looking.
Skin Issues: If you're going to be in porn, see a dermatologist or at the very least, don't do anything stupid like shave sensitive areas where a breakout will occur on the eve of your big scene.
Hair: I love hairy guys but I don't like seeing hair on shoulders, Dan Hedaya from Alien Resurrection.
Old: Some older man can be sexy and amazing performers but when it becomes blatantly obvious that the only reason that they are getting any play is because of $$$, yeah. Its not sexy or hot! You're just a John paying a whore!
Plots: Some scenarios can be hot with the right performer. Not all models are actors!
Editing: I second, third, fourth and fifth this complaint. The sudden transitions are annoying as hell, kills the build up especially when two guys are going at it, making out. I want to see some clothes being taken off, I also love seeing guys wear real underwear because it seems more everyday real. As the clothes come out, the bottom then focusing on slowly revealing his partners manhood is sexy.
Tattoos/Piercings: I can tolerate a few tattoos, but I dislike full on body tattoos everywhere. I dislike seeing the same tribal tattoo on many models. I also hate seeing piercings on genitalia. Eww!
Misc: Some other nits, cock rings, brown runny shit coming from the ass, dudes with wood issues, str8 guys (stay in str8 porn dude).
Same boring sets, choking during sex "WTF", twig thin twinks, unhealthy looking models "sickly, obviously doing it for the therapy money, fat disgusting dudes with twinks or younger guys, eww. Shitty production values, branded underwear that look like kid's underwear.