In his early adventures, Theseus showed everyone that he was a hero to watch. But when he slew the brutal Minotaur, he proved to the world that he belonged on the permanent Who's Who list of Geek heroes. Like many of his fellow heroes, he showed that he was brave and totally capable of slaying even the most terrifying of foes.
However, Theseus also proved on his Minotaur adventure that he was a flawed human being. When he deserted the Princess Ariadne and later carelessly caused his father's death, he showed he was far from perfect. Of course, he was not alone in this. Many of the other famous heroes like Heracles and Jason had some not-so-cool episodes in their lives.