In fact, they've written 45 reviews already, a fairly large response given the number of ratings returned.
You're right, a lot of raters must have given it Zero stars, if the rating is down around 1.5 ...... very low ..... but notice that the Metascore is 32, which is weak but more consistent with a show that is rated about 4 or 5. So that's another indication something funny is going on.
I've noticed that ratings tend to rise over a period of three to four weeks after release. Later viewers are usually kinder, even to weak fraternity-boy comedies.
Ping to my last.