For a while that one-star review was the only one, but the average is now slowly creeping up. Not a lot of people leave reviews though. I don't know if mods would look at this as an inappropriate review and do anything about it or not. I've had low reviews before because people can't find the track, so by their own admission they haven't even tried the very mod that they're reviewing .With so many mods available for AC now, it's only reasonable for people to try stuff out based on the mods' ratings, and a 1 star rating like that could seriously lower your average, and the possibility that other people might try it out (I think I'd ask for it to be removed, or re-reviewed sensibly, if it was me).
People are strange.