due to merit, we will know which posts are of good quality and which are lacking.
Not entirely correct, not all quality posts are rewarded with merit. A user can choose to merit any post he or she deems merit worthy, and keep in mind that everyone has their own method of determining which post to merit.
So just because a post wasn't merited doesn't mean it's a shit post or low-quality post.
Although am still a newbie as regards making post frequently and earning merits from them, it is noteworthy to state that post which guarantee merits has to be excellent in presentation and punctuation.
The forum is not a school that examines every user's post to see if they're using proper punctuation, and you should keep in mind that not everyone on the forum is from a country where English is the first/primary language. Although it is true that your post must be presented in such a way that those reading it understand what it is about easily.