I mostly write poetry which can have a different feel & flow to the words than an article or short story. The placement of words within my poetry holds meaning. Therefore, I would not be accepting of grammatical critiques to my poems but would appreciate it for an article. Stories are on the fenceline for me. When creating a story, you're using both material from your creative mind -and- using reality, from what you've experienced of the world. So, while I mostly feel that a story, whether based in realism or fiction, should be grammatically correct for the most part, it also has room for adjustment to reflect that not all people speak with perfect grammar. Some people have a little more "flair" to their speech due to the way they naturally connect words & sentences. I feel that we're all here to either be creative or to relay information. If the material lies all the way to the creative side, then I would not feel free to critique. If it lies to the informative side, then yes, critique away! But sometimes there is that middle ground & we need to remember that we're dealing with individuality. Spelling errors? Yeah, let 'em know (unless it's poetry as it might be meant to look a certain way.) In the end, everything written here should be readable and easily followed. If the ideas are coming across muddled, while within a piece that's meant to relay information, then that's not good and the writer should be open to considerate, suggestions.