A pet peeve of mine does have to do with imaging. In a system that properly retrieves ambient information, the ambient information will make the musicians seem less distinct in the soundfield. So a system that does that might get docked because a lessor system that is unable to retrieve the ambient cues has the images portrayed in a stark fashion. But the system that can portray the ambient information is the one that I would say is 'better', because it has the organic quality that is what you hear in real life.
BTW this is one of the areas that I find a good line stage to outshine any of the passives- PVC or TVC- that ability to reproduce all the low level detail, all the ambient information. However, I have seen a lot of passives beat out active line stages that are not up to snuff, so its no surprise to me that a lot of people might be convinced that passives are ultimately better.