Depends. Run it through copyscape or Google some key phrases in quotes to see if it's listed elsewhere. If it looks OK, then it's OK. If it doesn't, it needs an editor.

If the article is in English, I would say "yes".

What looks okay to one meticulous grammarian may not look okay to a more meticulous grammarian. I say this respectfully, but if you're not 100 percent confident by the quality of that article, hiring an editor is a good way to go.

By the way, when I say quality, I am not only referring by the quality of English, but also the quality of content in terms of flow and substance.

Didn't you hire a native English writer on oDesk?

Thanks warriors.
I think I know what to do now. Thanks all.

Be very careful where you get these articles. Some of these guys who 'write' articles and then sell them actually copy them from other people's websites.

I have had this happen to me many times (have people copy my content word for word) but didn't get upset because I know what goes around comes around.

Yes there are great article writers who write 100% unique content. Find these guys and give them business.

No offense intended, but in a post with a four word subject and three short sentences, you've made two grammar mistakes (one of them twice).

I suggest that the answer is yes...

Definitely.

I also do not intend to offend, but given the language difference, the answer is yes.

And, I agree with Alexa. You should not have to pay again to be able to use an article you bought.

The article should be good enough to use right away unless it's a PLR?

It might look perfect, but in order to be safe, it's better to check it for plagiarism.