TNT has been constructing a new neighborhood in a cable backlot. It’s not exactly a high-end development - the building materials are a mixture of the tried-and-true and the been-there-done-that. But the first residence (“The Closer’’) is remarkably sturdy and attractive, and the second (“Saving Grace’’) is reinforced with durable, unbendable steel (Holly Hunter).
Alas, every newer structure TNT has put up in the past year has been kind of shaky. “Leverage,’’ “Raising the Bar,’’ and “HawthoRNe’’ are almost willfully ordinary, as if the network is afraid that a bit of originality might alienate viewers. These are shows that go halfway there, with decent casts and strong production values, but then back off into mediocrity. And, beginning tonight at 10, “Dark Blue’’ joins their ranks, an unambitious cop drama subsumed by undercover cliches. Produced by Jerry Bruckheimer, whose “Cold Case,’’ “CSI: NY,’’ and “Without a Trace’’ repeat on TNT, “Dark Blue’’ is a wan effort.