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Denon stuff isn't usually that bad. I know plenty of people with their equipment, and to my knowledge, no problems ever.
If you sent something back for repair, and got the same problem a week later, then it's on them to fix it free of charge, including shipping if that was an issue. They pretty much have to cover it.
FYI, leaving something sitting around without use can be bad too, especially if it's in a wet or humid climate, though it depends on the type of hardware itself. Knobs/sliders, for example, can build up shit to the point where they don't make proper contact.
Additionally, anyone that knows how to use a screwdriver (with the possible exclusion of Michael J Fox) won't be leaving obvious marks on the unit, when they are opening/closing it 
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