I sometimes have issues raised because I always upload .rar files which have encryption on them, so they are a better option than .zip files which I have been told can carry viruses.
I had a bad review myself which I got removed by a moderator because a customer couldn't extract an OBJ file from a .rar archive. There was nothing wrong with the file they just didn't have 7zip (windows) or the unarchiver (mac) to open the archive. I think they were trying to open the archive straight into the 3D app. If you have been left a bad review then I'm sure CG Trader will look into it and probably remove it.