This started off as a response to Yuanls' recent diary (which I agree with wholeheartedly), but figured it was worth making a separate post.
Mapping improvement of any serious scale, especially for existing mapping is generally contingent on willingness to accept tips and feedback. I think a lot of the mappers who have been here for a while, including myself, are sometimes tempted to just blame new mappers for conflicts and a lack of receptiveness, but to be honest, in most cases, a lot of this is really contingent on how they're approached. While I 100% agree with Yuanls that we need to focus on fixing the front end in the expectations of new mappers, I also personally think all more-experienced mappers active in giving advice to newer mappers need to become much better at constructive criticism so that we're able to properly encourage newer mappers to improve rather than to fight us or to want to leave the site.
To be completely honest, the average critiquing style on OGF can often come across really toxic and condescending at times, which only grows the issue. Frankly, in addition to tweaks on the new mappers side, an "OGF:How to Give Constructive Respectful Feedback and Advice" page is probably in order for the older/more senior mappers here.
I've discovered even myself just these last couple months that a lot of newer mappers that can seem standoffish if confronted in an antagonistic manner are more than willing to take advice and tips if given directly, kindly, and with encouragement, acknowledgment of areas with potential, and respect. If our response to newer mappers is basically "your mapping is crap and you should feel bad", of course their response will be a defensive one rather than receptive. We don't want that. The spirit of the OGF experiment is one of collaboration and respect- and that spirit won't thrive, or frankly, survive, if we don't know how to approach mappers respectfully when giving feedback or advice.