Alignments and fictional characters
I also thought this discussion is interesting and may even give the "Complete Scoundrel" a look, although I've been buying fewer splatbooks in preparation for D&D3.6 or D&D4.0, but that's for another thread...
I would also make Robin Hood of most legends and later versions Neutral Good. Except for some modern revisionist takes, he is helping Anglo-Saxon peasants against cruel Normal feudal lords (yes, it's ahistorical propaganda, but that's also another story). Who's to say that the Bill Gates and Donald Trumps of today aren't corrupt plutocrats? ;-)
I would give Indiana Jones a NG. Yes, he prefers to put artifacts in museums, but why not leave them with the indigenous peoples? He's not averse to working with smugglers in "Raiders of the Lost Ark," and in the later movies, his hatred of the mostly Neutral Evil Thugee and Lawful Evil Nazis overcomes his reluctance to be a hero, not a strict code of honor.
As for Batman and Superman, I agree that their alignment depends on which version--comic book, animated, or live-action television and movies. I see the iconic versions of both superheroes as being different strains of Lawful Good, just as Paladins of different deities might approach situations differently. Batman may be a vigilante, but he tries to uphold most laws in an effort to protect the innocent of Gotham City. Superman generally respects authority, but that doesn't stop him from opposing Lex Luthor, who has been U.S. president.
For those of you reading Marvel Comics' "Civil War," how would you describe the alignments of the main characters there? How do they relate to D&D? Lately, Captain America has been breaking laws, but his ideals may make him Lawful Good not unlike Batman or Superman above. Iron Man and Mr. Fantastic have committed some evil acts in the name of what they believe is a greater good--Lawful Neutral? Misguided Lawful Good? Slipping toward Lawful or Neutral Evil?
In my game, Paladins have occasionally slain someone in the heat of battle, only to realize later that the foe wasn't truly evil. Atonement rituals usually ensue, and this is a good way to encourage role-playing over mere hack-and-slash tactics. Talking to one's enemies, even in combat, is a properly cinematic/literary part of genre entertainment, IMHO...