I not at all into the police/detective genre that much. It's too episodic for my taste, still though I've watched a few of these and they've been alright.
I love mystery/suspense stuff though, like Liar Games and Quiz Show etc.
Actually currently watching Keizoku 2: SPEC and it's the best detective/police drama I've yet to see. Much thanks to Erika Todas amazing performance and the wonderful humor of the show. Which the latter might be a case of aquired taste.
