In the original conception of this show, it was to be presented in documentary form, with a film crew following the officers of the Detroit homicide department. That changed for a variety of reasons, but the remnants of that concept are the only distinctive things about the show.
Which is not to say that they're good things. Take, for instance, the on-screen captions that tell us which case we're focused on at any moment. Each case is given a nickname ("Double Pharmacy," "Bullet Train"), and each scene is introduced with a caption explaining which case we've cut to and what's happening ("Bullet Train: Victim's Autopsy"). But in 2010, audiences are perfectly capable of jumping among multiple plotlines, and all these captions do is make us feel like we're watching a show that's been subtitled for the mentally challenged.
Apart from these odd touches, the show is a standard police procedural. It's competently made, and there's nothing terribly wrong with it, but it's the TV equivalent of a Big Mac: It'll fill your stomach, but it doesn't have much nutritive value.