Anyway, an American with a little bit of training with one of these http://www.albion-swords.com/swords/albion/swords-albion-mark-nextgen.htm would destroy any Ninja, Samurai, or any other Eastern warrior and only may find a decent opponent with European Medieval and Renaissance Knights. I didn't think I would end up going “there” but the silly turn this thread has taken I don't think I am trolling too hard.
The point I was making is that ninjutsu is out of date and would be utterly ineffective in a modern setting. I stand by that assertion. Ninjutsu is of interest to antiquarians only.