How does Ninjutsu compare to other martial arts?
Most martial arts that we are familiar with today are rather new; developed either during or after the Meiji Period (1867-1912) to be enjoyed as sports or for spiritual refinement. Even though they are oriented towards actual fighting or combat, they are not sufficient for life or death fights - but then, that was not the goal. It is important to remember that Dr Kano developed Judo as a sport to introduce to the schools, Funakoshi did the same with Karate, and Ueshiba developed Aikido as a means of self-improvement and spiritual enlightenment. Having said that, this does not mean that these arts are ineffective, merely that they were refined from ancient Samurai combat systems to have a different and sometimes very specific focus
Ninjutsu, in contrast, is a broad-based ancient martial art that developed through more than a thousand years of actual combat experience. Ninpo Taijutsu (Ninjutsu) and the other styles taught in the Genbukan system are with us today because they survived in the midst of actual fighting and did not die out on the battlefield. The techniques did not go through a period of change to make the art more "sport-like". Because Ninjutsu, as it is taught today, maintains the combat-effective techniques it is often said to be the art of survival, the art of winning.