It was the lack of reasoning that annoyed me the most. Ok, massive the paper was on the border and you needed a few opinions. Then give us the reasons that made it borderline so we can improve for our next place. That's being collegiate.

That I can understand. When I started doing editor-rejects, the agreement was that decision letters need to be helpful and give clear reasons. If they didn't do it, they should not need much time (and they have a bad SOP).