Let's put at it this way.
This is Delmaria Darkskull in Disney's Pirates of the Caribbean Online. He's a very romanticized version of a pirate - he goes out of his way to fight for the good of the people, he opposes tyranny with a passion, and supports individual and governmental independence. He is very honorable, and he believes in freedom and being the good guy in a world filled with back-lot deals and illegitimate business.
This is Delmaria Darkskull in a more realistic perspective. He works for whoever gives him business - he doesn't care who he stays loyal to or what he does so long as he is rewarded properly. He not only lives in a world of murder, crime, and so forth, but he is also a very large participant in it. He is often the catalyst in many bloody and gruesome battles, and pillages and plunders many innocent merchant ships in the most ruthless way possible, to instill fear in others.
Which one do you think is more "pirate-like?"
Roleplaying and speaking like pirates (aside from "sailor language") is one of the many things I encourage in this game, because it really adds to the atmosphere. However, making the game more pirate-like itself would then just take everything to a level that Disney rarely does (if ever) venture in to, and would surely end up to somebody being upset simply by how graphically natured "real pirates" were.