So, with rare exceptions, the video you watch isn't going to be anything like the films you're used to viewing at the local cineplex. In terms of budget and therefore overall appearance it'll be a close, though genetically inbred, cousin of B-movies. It's also important to keep in mind that you're going to be watching a video made to feature one thing: sex. Porn makers know that the reason anyone (outside of their peers) is watching their film in the first place is to see explicit sex. So the focus in each and every film will be the sex scenes, with everything else taking a back seat.
The need to focus on sex, combined with a small budget and minimal resources, often compromises vital aspects of the video's quality. Poor sound quality and looped scenes are an unfortunate result. Sound issues can mean hearing the sounds of the production crew, muffled or inaudible dialogue, or annoying background music—sometimes, lamely enough, just music playing in the room where the actors are having sex. A huge complaint from viewers is having to sit through scenes that have been cut (often poorly) with looped film, meaning the action (such as a close-up of a blow job) is edited in repetition to make the scene seem longer. Another annoying corner-cutter found on all-sex videos is the technique of intermingling higher-quality scenes with badly filmed, lackluster scenes, for filler. As if we wouldn't notice.