What Mr A view as quality post, may be a spam to the other person
It rarely happens because a non spam post is a non spam post, I believe it will be always like this. Exceptions are people who are extremes far or left and disagree with the crowd. The majority will definitely agree that it is a non spam post.
Another thing is quality post, that is far above non spam post, and assessment of a quality post can lead to more inconsistency in the crowd. Different people have different criteria on post quality and context makes sense too. If you make a same post, in different threads, one can be quality and others are non quality or even off topic or spam.
regardless whether the wall of text is large or not, as long as it carries a message that I can relate with and to, it may look as not spam post
If a post is helpful, it's quality one.