It's easy to like tragic movies with cathartic endings. "Okay, everyone's dead but they died for something, so it's uplifting in the end". But there are also tragic movies without such an escape latch. The top three in my opinion are "Come and See", "Army of Shadows" and "Irreversible". Well, in "Army of Shadows" people die for something but there isn't anything remotely heroic in their self-sacrifice.