Martial arts, useful or not?

To people who think kung fu martial arts are useless... only if they have enough of a brain to understand what i am about to say,

Its not like in a real fight all the guy would use is the fancy stuff, like who in their right mind would. they could just use some simple punches and kicks but incorperated with the speed and physical power they had trained for. Of course if they were to do like spinning flippy kicks over the guy they'd get their butts kicked, but kung fu isnt crap, with the training, as i said, they train hard and they get great speed and power so they become stronger. Saying that "some" moves of kung fu, not the fancy fist movements and stuff would be good in a fight, but stuff like they way they train for the fancy movements, that could make them much more limber for evading a simple punch or kick from any guy on the street. It's not in the martial art, it's all in the fighter themselves, if they are to incorperate the useful stuff, and just not even think about the fancy useless stuff, then kung fu or something like that would prove useful. there i have said it. Think of what you wish of me, but thats what i think