I think a basic problem with all USB kit is that manufacturers "self-certify" their hardware, so there's really nothing to stop them selling junk with the USB logo on. And they do
Google for "Benson Leung" to find a load of reviews which name/shame/praise various vendors.
Personally I'm also looking forward to Kobo ditching the horrible micro (or is it mini?) USB cable with its super-easily bent connector.