I, too, have received misshapen and dirty eggs. I set them.
I do consider them when I set them and rearrange my Sportsman so the worse ones are on bottom in case anything should happen. I do not hatch in my Sportsman so I have no problem with chicks underneath. I keep a tray down for spilled water or the occasional drippy egg.
Having said that, I have had wonderful hatches from dirty eggs. The last one of shipped dirty eggs was a 100% hatch so I find it odd when folks feel the need to wash eggs. And in the past I have had plenty of misshapen eggs to hatch. Not the torpedo ones but flat sided or extremely round eggs.
I sent eggs to a lady (and funny that it has only been one person) and she was extremely upset with getting dirt smeared eggs. She said she had to wash them before setting them and figured none would hatch. How crazy! I set the same dirt smeared eggs at the same time and got a great hatch. I always try to set some eggs from the same pen to make sure of hatchability, though I know the PO can be a cause. All I can say is her loss because I get much worse sent to me and get good hatches and great chicks.
Really, how dirty are hens anyhow? Some of my broody hens have gotten the eggs gross from being out in the rain and mud. They don't know how to wipe their feet, for petes sake! I have chicks everywhere from plenty of "dirty" eggs.
Sorry! Off my soap box now!