One thing I frequently mention in the Fan Filmmaker's Primer thread
here is that "sound trumps picture", and rotten sound demolishes everything. I always stress to fan filmmakers that they need to get decent mics, record sound to something other than the camera, and set up a proper acoustical environment on set to ensure decent sound (e.g. sound blankets). In fact, sound is so important that some professionals get thrown off in rough cuts because of the uneven/unmixed sound. This is very true of fan filmmakers, too, so much so that when showing rough edits to those people I do a lot of sound work on the rough edits so that people will not be distracted by it, even though I really shouldn't mess with the sound at all until the edit is locked.