I have to sub out work all over the country so I look at the reviews and make decisions based on what I see. If I see someone with a pattern of negative reviews, that's a tip-off. Less than 4 stars and you're taking a risk. Almost every company has one for two bad reviews, and I read them to see what they are complaining about. Twice I had to go with someone who's reviews raised a red flag.. and both times I was burnt.
If it were me, I'd be asking them to change the review. I remember when I used to sell on ebay we would do it all the time and about half the time they would change.
Reviews are important.. but if I saw that one from you that wouldn't hurt at all, especially if you reply back to it in a professional manor.