>>5455
One of the things I enjoy about film is often the lack of overbearing narrative, that is so common in literature and elsewhere. It's not uncommon to have certain documentaries that don't really have any clear message, but are more or less an aesthetic exploration of the subject.
In terms of Malick, there are some pretty dope explorations of morality/conformance in Badlands, and Thin Red Line is an excellent 'philisophical' exploration of the nature of war.
I agree that Herzog and Kiarostami are great places to start at. Though in general, I think you can find films that have excellent explorations of the respective subject matter regardless of the 'genre' of the film. I could maybe recommend more if you gave specific examples of film that fit the criteria you are looking for that you have already watched.
One that comes to mind, given your partiality towards DFW, is Un homme qui dort, which is an exploration of depression and angst manifested in a Parisian student. It's one of my favorite films!