If you're after demented, The Happiness of the Katakuri's is pretty well up there, and I'd probably toss in The Death of Mr. Lazarescu, which is less insane than scarily accurate.

Ong-Bak had awesome fight scenes, no doubting it, but the rest of the film was balls, especially that ending. The Raid's fight scenes weren't as good (though still very, very good), but the rest of the film was a whole lot better than Ong-Bak, hence me saying it's better =P