Magus_Apex get enough traffic and the ratings will come, especially since leaving a review is now a mission.
It also helps if your novel is on either extreme when it comes to quality.
People think it is flaming garbage? They cant wait to tell you how many brain cells they lost reading it.
People absolutely love it? They will gladly leave a review expressing every good thing about it and then proceed to demand more chapters. If you do not comply, they will probably tell you to eat a dick and that you suck as an author.
Then there are the spammers who leave a 2 star rating along with absolute gibberish. Assholes.