I've had negative responses to small, isolated submissions that I've heavily QA'd and semi-positive responses to longer ones. I think it has less to do with the "realpolitik" of the code itself and more to do with the maintainer's viewpoints about whether AI as a whole is a positive or negative thing.

I tend to respond quite well to AI-authored or assisted PRs to my project, but to be fair we maybe only get 3-5 PRs in a good month.