I am frustrated by the deletion of posts that were bad, but provide an opportunity for the poster to fix it.
I just saw a post a bit ago where a poster was asking for help with his website, in the usual vague terms, but was obviously struggling with a language barrier. The question most certainly should have been closed... no question. But I think it would have been better to close it and provide information in the comments about what they can do better next time.
Are we here to help or not? Even if you feel you wouldn't waste your time on it, others may take some time out to help people ask better questions.
Edit: Do posters of deleted questions have the opportunity to see that they were deleted? If so, perhaps this isn't such a big problem, provided that someone does leave a comment with explanation before deleting.