For the last half a year or so I've been jumping in between j-sploitation and new wave of japanese gore (Yoshihiro Nishimura, Noboru Iguchi, Tak Sakaguchi etc.) and various crime series, especially Scandinavian. So while Japanese presents visually stunning and truly excellent movies without boundaries of imagination, Scandinavian crime is somewhat darker and, well, more acceptable. And I think I haven't watched any of the series that I've been disappointed or something like that.
Currently watching Beck. Last few series that I went through were: Broen (awesome Kim Bodnia (from Pusher) and somewhat beautiful Sofia Helin), The Killing (Forbrydelsen) (first season a little two long. others - perfect), Wallander (both are good, Swedish and British, just there are a couple of series based on the same novel so they are identical), Those who kill, and few not Scandinavian, but also great series: Wire in the Blood (dark!!), Cracker, Inspector Morse (more traditional detective. Calm) = Inspector George Gently
Could't go through a single episode of Whitechapel and Foyle's war though.. Boring. Also tried watching Castle, but damn it's shit.