John,
We can agree to disagree. It's not about the price - It is about the overall quality, not just the visual aspects.
You are more qualified than most, willing to invest the time and effort to make the changes and modifications. Not everyone is willing too or wants to do that.
You also made my case with the last comment - " would be a bit more upset had I paid Lionel, Atlas, or MTH prices for these hoppers and had similar issues, but I didn't, I paid $99.99 for six of them".
It is unacceptable for any manufacturer to deliver poor performing products. If they don't perform or are damaged I return them, many times for a replacement or alternative but this thread is more than just a few minor adjustments.