Wonky mounting, bad cutting, marks and dust were the main reason I stopped using Kodachrome a couple of years ago (I raised the issue at the time and a thread followed) The British and European processing were in my long experience excellent but good ol' Dwayne's couldn't seem to get to grips with these most basic aspects of film processing.
This is why I stopped using Dwayne's a few years ago. They are only interested in processing as fast as they can and they don't need no stinkin' quality control.
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.