The tone is very poor. "This is bad: closed" is not a friendly way to communicate and attract contributors. There are obviously better ways of encouraging contributions to match quality requirements/project style.

I read it all... it is hostile, the MAME owner clearly can't be bothered and just wants to close it, and while I can empathise with being inundated with PRs, it's still possible to be accommodating without actually donating much time, you just need to point people in the right direction. and in the event that something is fundamentally incompatible with the project (which this is not) you can show a little class.