I always cringe when I see ads that use sloppy English grammar or inelegant phrasings. I realize that not everybody has great wordsmithing skills; however, it seems to me that if you know this to be a weakness, you should solicit help from people who do have better writing skills. At the very least, have somebody check your work for grammar and style!
These shortcomings are more understandable when dealing with ad materials from overseas, especially China. That's why I was impressed with this site. These folks clearly took the effort to ensure that they used elegant wording and proper grammar. Very few companies do that sort of thing nowadays.