I try not to judge an article/blog post on the quality of the grammar when the ideas they are trying to convey are solid and useful.
There are some exceptionally fantastic minds out there that are able to succinctly explain, sometimes difficult, subjects.
I appreciate them for at least trying, and if they explained it in a language that is not their first language, all the more respect to them.
While I can agree that pointing out the spelling and/or grammar mistakes could be constructive, calling the article "un-shareable" because of them seems terribly over-the-top.
I can appreciate numerous spelling/grammar errors making you analyze an article with a bit more scrutiny. However, I can't think of a single example of an article with those kind of errors where I couldn't figure out from the content whether I thought the author really knew what they were talking about.
At any rate, I think there is a big difference between an article needing a little bit more scrutiny, and the article being "unsharable".
Just to be clear, I don't want to give the impression that I don't think spelling/grammar matter (even for blog posts). I just think it is easy to get so pedantic about it that you place far too much weight on them.
I have my own set of pet peeves, and am probably guilty of allowing the violation of one of them to taint my view of an article too quickly and too often.
And of course, there are always those articles that are so bad grammatically that it looks like a first-grader wrote them (but I don't think that's the kind of article we were discussing).