I don't work for anyone in the media distribution business, but I have been badly let down by media from one of the suppliers, and have found media from the other to be very reliable.
There are only really 2 distributors of media in the UK, (and a couple of very small players). Most of the negative comments about one of the suppliers were originated by the other supplier, who found they could no longer complete on a level playing field. You are unlikely to have been made "privy" to anything but a load of lies.
I don't think duff media is anything to do with truely independent distribution companies (but 1 of the big UK players is partially owned by one of the manufacturers and only distributes their products), the responsibility is that of the manufacturers. The factories should not sell anything except grade "a" media, selling something they know not to work properly is against the law in the UK. I really don't care about the price of media, I just want it to work, and keep on working for a reasonable time (10 years is a nice round number)
I have clearly stated my media of choice. It comes from one manufacturer, that has never let me down (so far). I don't care whose brandname goes on the disk. (PS I don't work for CMC either)
And one final thought
If someone like SONY started selling their rejects through a company like DIXONS/COMET/PC WORLD who would you blame when the product failed after a short time. Manufacturer or distributor? (I know who I would blame)