First, because films like that are hardly made anymore. Second because the director managed to set a philosophical debate that doesn't get you bored (and the film is 3h long). I think the 'journey motif' it's what moves the action forward, and keeps you watching. Also the mood and the jumpy characters contribute to overwhelming sensation of unknown to be discovered. This film leaves space for interpretation and character analysis. It does not serve 'fast processed food' but let's you indulge in the cinematographic feast. Third because 'Stalker' was made in social realism period in USSR and somehow it gives me an impression of much freedom. I think the director managed to compromise without loosing his integrity. Metaphisical journey of a stalker,a scientist and an artist but I'm sure each viewer may see a different depth to it...not to be missed.
