I'd have to second this one. Hiring an oversea's copywriter because the client insisted on getting the cheapest one available.
It was disaster. I spent more time fixing and correcting the copy for grammar and SEO than they spent writing the content.
After about a month the client agreed, and we hired a favourite local copywriter of mine who nailed the copy first time. In the end she only cost a little more and because she could meet the client, we formed a great team and work to this day together.
I put that down as a reminder that I won't work with an overseas writer again.