From time to time I review Low-Quality-Posts which are in fact very high quality from technical point of view, but lack the explanation. These kind of answers usually come from higher reputation users.
There are no good solution for a reviewer - it is a pity to delete good answer, but at the same time a few lines of code (or even one) is completely useless for the asker and later viewers, so in principle those posts should be deleted. The reviewer can edit reviewed post himself if feel up to the task, but that is not always the case and sometimes is a significant effort. A good example comes from a related question on meta: Low quality posts from high rep users. That post was extensively edited by moderator and finally ended up as a community wiki.
Wouldn't it be a good idea to add notification to the user that his/her post is in low quality queue, so that he/she can take a second look and edit the post himself to prevent from being deleted?
I'm not sure whether that's good idea for newcomers (they could be confused), but it would certainly remind high rep users to keep theirs posts on an equally high level.