This is something I’ve noticed a lot of recently in the review queue, and it’s not a problem unique to MY.
Going through the close votes, I’ve noticed that a large percentage of the recent votes simply vote to close without letting the owner know why. Not only does this not help the owner know what’s wrong with his/her post so that it can be fixed, but if the OP doesn’t have enough reputation, they won’t even know that their post has been voted against.
My personal feeling is that if anybody votes to close, they should post a comment explaining why, perhaps with a link to the relevant FAQ page. If there’s already a comment there, maybe you can get away with upvoting the comment.