Sad it was cancelled. In the beginning I was a little disappointed that it was "just" a cop show, but it grew on me as diferent sides of the show emerged and it stopped following the formula - case of the week murder to solve.
I love this show it just keeps getting better. The first season wasn't the strongest but it was more to set up for season 2. After that it improved so much, and right now its the strongest its ever been. It was an amazing season 4.