Really? What corrupted disk images are you opening? I've never had it report an error, and I download software in .dmg files all the time (and wait for verification all the time).
iOS SKDs are where it usually happens for me, but it has happened other times as well.
When using Windows, one of my first troubleshooting steps is to reinstall the program. I (almost) never do that on the Mac. I'm guessing part of the reason is that Mac OS detects corrupt files before they are installed.
Once or twice it's tried to mount an image that didn't completely download.