Some movies would be so much better if they could figure out how to not take themselves so seriously. So much of Ninja Assassin (including the previews I remember) seemed like it should be able to poke fun of itself, but it just never found a way.
The music over the closing credits also seemed like they’d originally planned on having fun, but someone never told the director. I don’t know, all I know is, copious amounts of free flowing and splattering blood do not belong in a movie that’s trying to be serious. It is just out of place.