TheGrandPreceptor
I'm not sure what thread you're talking about, because I'm super tired and haven't had coffee, and things tend to blur together for me when I'm this tired.
Destructive readers is a place where you can get reviews yes, but also you can get helped seeing flaws in your story (something an editor also does), and have your grammar looked at and corrected if you ask. Plus as a writer, its good to read what other people are writing. Its a good way to measure where you feel you are compaired to others. Maybe take things you like and put them into your story.
The best way to improve your grammar is to read works with good grammar, and DR is a community where almost everyone's first language is english (please god don't quote me on that).