Good street work has all the elements that any good two dimensional work has. Repeating shapes, leading lines, tone, implied movement, a sense of geometric rhythm and other visual devises that make good images. Good street work is more than just random shots of people on the street.
I think the way one approaches the homeless less fortunate is the key. All you have to do is look at the work of Davidson (East 100th Street) Walker Evans, Dorothea Lange and any of the other FSA photographers for the right approach. It's not taking photographs from a half block away with a 400mm lens of a less fortunate person digging through a garbage can.
Theres going to be a great movie on street work and some of the truly great photographers that work in that arena coming out soon. Heres a couple of trailers.
Some of my favorite photographers are feature. Davidson, Meyerowitz, Erwitt, Mark, Freedman, and a few others. I had a chance to meet and see Davidson and Weyerowitz speak in the 1980s. I think Meyeowitz had just finished the book Red Heads and Davidson was just finishing Subway.
Heres a couple of trailers. Give them a moment to load.
In the first one Meyerowitz gets to the reason why some do it.
http://www.traileraddict.com/trailer/everybody-street/trailer
http://vimeo.com/70639661
http://www.youtube.com/watch?v=2vqCd2K1-KY
To the OP. Don't worry about classifications and what people say. Either you believe in what you are doing or you don't. I hate the term street or really most classifications.
Heres some really great words by Ansel Adams on the subject. Unfortunately we have become more label oriented instead of less as he had hoped.
"Lets hope that categories will be less rigid in the future; there has been too much of placing photography in little niches-commercial. pictorial, documentary, and creative( a dismal term). Definitions of this kind are inessential and stupid; good photography remains good photography no matter what we name it. I would like to think of it as just “photography” ; of each and every photograph containing the best qualities in proper degree to achieve its purpose. We have been slaves to categories, and each has served as a kind of concentration camp for the spirit.”-Ansel Adams