Just an opinion with insights as a bilingual. I think the FAQ or another area on SO could benefit from a clear illustrative example of what constitutes a quality question in terms of structure. I mean a newcomer who has a A1/A2 (or even B1 CEFR?) level of English won't necessarily catch on to mentions of "quality standards" or format.
Well, it really depends on the nature of the question, and it isn't just about language to me.
A good question gives as much information as possible about the environment, hardware and other such things.
A good answer is clear and stands on his own merits.
On SU, we've fixed up answers in Russian and found that had it been in English, it would have been a pretty good answer. Bad language quality is fixable. A link only answer might be fixable. Garbage is garbage, and is quite obvious. I don't think its an English issue. It's an effort and overall quality of information problem. Giving a example of a good question or answer linguistically won't help a question with insufficient detail, or a rant in perfect English as an answer.