I think that D-Man was a fairly noble superhero who had some enjoyable stories during Mark Gruenwald's Captain America run.
I do not think he would have made a very good Avenger, but I enjoyed the fact that Captain America asked him.
Later on, I thought it was interesting to see him become a hero for the homeless (although I did not like the way it was played for laughs in early issues of Avengers Volume 3).
Therefore, I think there is enough interesting stories in the idea of a superhero for the homeless that I would not have made D-Man the psycho he was made into during Brian Michael Bendis' Daredevil run. It was an ignoble result for a noble hero.