I recently reviewed this answer that was (likely automatically) flagged as low-quality because of its length:

https://superuser.com/review/low-quality-posts/234462

I feel that this was a good answer because it answered the question, despite being concise. But sometimes I run into answers where I feel there is more information that needs to be included.

What is the best measuring stick when encountering answers like these, besides "it answers the question". How can I arrive at the conclusion "good quality" or "bad quality" simply by length? What more should I take into consideration?