The consensus seems to be that it probably did contribute somewhat to less crime, but not as much as early proponents claimed it did. I hadn't heard of this research before
In Chicago, the researchers Robert Sampson and Stephen Raudenbush analyzed what makes people perceive social disorder. They found that if two neighborhoods had exactly the same amount of graffiti and litter and loitering, people saw more disorder, more broken windows, in neighborhoods with more African-Americans.

