Well, if they had a 30% defective rate as AV123 says
they have with the MFW, they'd have quality control issues. AV123's quality control department though, is you.
If Denon kept sending you one defective amp after another like AV123, I'd say they had quality control issues and then some.
If Denon sold products where the finish on the unit cracked (like the MFW veneers) and then offered you a $100 store credit as compensation, why that might be more than quality control issues.
If Denon sold products where screws were missing and things rattled (like the gaskets on some MFW units), they'd have quality control issues.
If Denon sold other products and people were waiting for 1-2 years for a replacement amp (like the UFW sub), I'm not sure where that would fall.
If Denon held onto a product in one of their living rooms 'testing' it for you for over 6 months after you paid for it and said they misplaced your address, I'm not sure where that would fall either.
The problem with people like you is that you act as an apologist for what I've listed above (and that ain't all, brother!) and try to make it like all companies have similar problems. They don't. If they did they'd be out of business, sued, and brought up under sundry criminal complaints with the State's attorney general. This company has a shoestring and threadbare infrastructure. You can though count on a certain degree of consistency. Messages will be missed. There will be problems with various email accounts including Yahoo?. MLS will always be sick and so will most of his employees from time to time. Why, there's such a chronic issue with people getting sick, you'd have to wonder what's going on? Substance abuse issues? Just bad luck? Being around all those speakers? Heavens! Call the CDC!