I would disagree that there's any problem with this outstanding show. The cops it depicts realistically have their flaws, some of them are in fact unlikeable but others, despite some venal tendencies really end up doing the right thing for the right reasons. Welcome to real life and to most big city police departments.
Specifically, the young rich cop and Regina King (the black detective) IMO are both quite likeable because their ready defaults are honorable.
geno and idzik have done the impossible: make jets fans wish the tanny/sanchez days were here again > Darksider, Jetnation