I just finished "I Saw the Devil', and I have to say it's seriously overrated, and I don't see how it qualifies as horror. I guess it's in the same vein as Texas Chainsaw Massacre? More gore than scares for me.
I never really saw it as horror...its more action/thriller to me. I wouldn't say its overrated as I think its a great revenge film. I don't think it was meant to scare. South Korean film is very gory and extreme whether its a thriller or a comedy lol