The first season deserves at least four stars, but the show falls apart with the second. The transition between the seasons is rough, leaving the death of a leading first-season character incompletely resolved.
The second season lacks the tension of the first. The new female detective is unsympathetic. She's quick to hop in bed with a stranger and punch anybody who gets in her way. She is constantly rude and antagonistic toward an older, fellow officer although he does nothing to provoke it. She seems to make everything about her, rather than the crime she is trying to solve.
The first season is worth watching. The second season is a two-star disappointment.