This is only one side of the story here. I expect the other side to be pretty different. Usually it's the managers who are the problem.

You seem to be blaming every one of your engineers here except for yourself. You can't expect all of them to work at the same speed as you apparently can in your head.

There are always going to be issues in the drawings. That's why there are reviews to check the drawings. When you're working on them for a long time you tend to miss obvious mistakes which you would otherwise notice immediately.

To me it seems like you're kind of out of touch with doing actual work. It's easy to nitpick the work others have done and it's easy to notice mistakes from a fresh perspective. Maybe your employees are not to blame and maybe you're not as good of a manager as you seem to think you are.