Slow burner or intense from beginning to end?

It's kind of a slow burner, albeit a somewhat unconventional one. Something is always happening. Something is always trying to work the emotions of the viewer. Not a lot of time is spent on the mundane, as the first 3rd of the movie focuses on the investigation, the 2nd is based around the counter-attack and the 3rd is based around the last stand.

It is long though, so maybe that's why it might seem a little slow.

my reviews of martial arts and horror films
http://www.bitfister.com/martialhorror

I agree. It starts off as a rye cop investigation but evolves into a serious horror by the end. I was a bit surprised, but going for the ride, enjoyed it, even if I didn’t fully understand it (it seems contradictory at first). But after reading some interpretations, more impressed looking back.