This is stupid. Pirates have become far too glorified recently (curse you, Johnny Depp!), but anybody can see that pirates are jerks. They sail around, killing, looting or raping anything that gets in the way. Pirates are cool in the same way that mass murderers are cool.
Ninjas, however, have honour, integrity, all that stuff. They only kill when they need to, and they do it with style. Also, being a ninja requires skill. I'd like to see one of you guys do all that fading into the shadows business, or sneak around in complete silence.
Several people on this thread have mentioned that pirate films are better than ninja films, which I agree with, as well as ninja games being more fun, which is true. But we aren't talking about aforementioned media glorifications, we're talking about the real deal. And the truth is, pirates are heartless bastards.
I rest my case.