I would call this an "absolute movie" (similar to an "absolute music"), talking story by extremely abstract language of a cinema. Great acting, plot, soundtrack - are in a harmony with Gilliam's genius telling us eternally old story of a rivalry between good and the evil.
Brilliant acting turns psycho Lego blocks of the imaginarium into a masterpiece and a significant event in the history of a cinema. Inner similarities between Joker and Tony Liar scares for a moment to the extent that gives an impression of Ledger playing himself and doctor’s mind is barely mirroring Terry Gilliam’s own! This “for selected tastes” movie I watched twice and planning to go again despite the fact it does not have 3D effects of Avatar.