Yeah, be wary of reviews and iTraders. I really firmly believe that people give great reviews for three reasons: 1. The copy is actually good. 2. They were happy with the communication and don't want to leave a bad review. 3. Bargain basement pricing -- they got more than they paid for, so they review and say it's some of the best copy they've ever bought.
If you're looking for good writing, you need samples that are written for you -- if you're paying good money, you shouldn't have trouble finding a writer willing to whip a sample or two up for you.