It seems that I may be in the minority, but I contested a 1 star written review because it was obvious that the reviewer didn't read the description and didn't even try the app before reviewing it badly. I reported it to Apple, stated my reasoning and within a day or two that review was removed. It was for this app: http://itunes.apple.com/us/app/basketball-shot-tracker-hd/id...
Granted I only did this once, but I think that since it was a clear cut case, Apple quickly removed that poor review.
I successfully contested a customer review that was basically a text dump of promo codes I had posted elsewhere. But had no luck with the review I posted above, where I think it was obvious the review never read the description. Your milage may vary I guess, just like with app reviews.
Granted I only did this once, but I think that since it was a clear cut case, Apple quickly removed that poor review.