Robert Frank

I rather enjoy Robert Frank's work for the fact that it is not perfect. Most of his work, in fact, was far from it. Sometimes blurry and out of focus, I think it actually represents reality better than most of the "artistically correct" photographs that I have seen.
While Frank's subjects are sometimes considered bleak and depressing, I actually find them to be realistic. Life is not always peaches and cream. Robert Frank was able to portray the reality that was there instead of the reality that people would prefer. In fact, as far as heartache goes, Robert Frank had more than his fair share.
Do you think that being a glass "half-full" or a "half-empty" has a large impact on an artists work?