Graffiti and broken glass don't ALWAYS indicate a neighborhood is D class, but actual records of crime certainly will.

It's actually the worst out of the 20 major cities and barely slides past national inflation rate.

From what I gathered, previous landlord did not treat his landlording duties as a business and let everything slide.

In anticipation of some objections surrounding the Realtor bit, below is a peer-reviewed economic study that empirically demonstrates Realtors do not sell the home for more money than FSBOs, nullifying their argument that their marketing efforts of iPhone photography, and picture slide-show "virtual tours" will somehow sell it for more to cover the extra cost of the commission.https://www.econstor.eu/bitstream/10419/38634/1/57...

Hurt them enough, and they shatter like glass.

TV is a big time waster, lack of exercise kills your machine, reading expands your mind and possibilities, alcohol to excess is fattening and poisonous (I'm a big proponent of the 1-2 glass wine/day, however). 

Still some others are the types of people who see the glass half empty. 

Look at slide 2 with the historical %'s.

Glass jars, food containers from takeout places, bags, clothing repurposed into rags, etc.

The problem is that wealth accumulation often causes people to want more, so the scale slides.