Of course he does credit to his parents as Batman otherwise there would be no comic. But (and this is mostly about writers) making Bruce Wayne as a public figure nothing but a do-nothing semi-intelligent playboy which does little credit to the man Bruce really has become. This whole Hush storyline in Streets of Gotham (which I'm not really a fan of) has Bruce suddenly (in the eyes of the public) leave the jetsetting crowd in Europe to become Gotham's benefactor (more than usual). Now of course we the readers know he's been doing this already but there was nothing stopping the real Bruce from doing it. Batman does a great credit to his parents, "Bruce Wayne" only does so based on who's writing him - some being better than others.