I am not sure why there are low ratings, but I am guessing people do not watch a lot of dark comedies. That is what the show is, unfortunately the listing says comedy - so people expect flat-out jokes over the satire and commentary.
Overall a good cast, solid writing, great story arcs, but what shines the most are the commentary elements.
Overall a good cast, solid writing, great story arcs, but what shines the most are the commentary elements.