Turning the most famous woman in comics into a former prostitute that decides to wear a costume after seeing "a real man", and then having her become a prostitute (Madame, whatever) again as she gets older... this still remains the worst thing Miller ever did, and one of the worst moments in comics history.
Which is a pity, because I otherwise love Year One to pieces.
And of course, other people just had to keep trying to top it. Not just a prostitute, but a raped underage one that ended up in the hospital pissing blood! And her first costume was fetish gear one of her "Johns" wanted her to wear! And not only was she underage when she was introduced to prostitution, she was VERY underage, and her bestest friend in the whole wide world ended up going crazy and trying to kill her, years later, because she and Selina were both working the streets and Selina wasn't the one picked by a VERY bad man!