he's right, basically the use of Kung Fu to mean chinese martial arts originated in America when Bruce Lee first hit the screen there big time, i can't quite remember what film it was but he used Kung Fu to describe martial arts and from there it has stuck. Kung Fu does translate best to 'skill' but the term Kung Fu is so commonly used to describe Chinese Martial Art that it is now prefered to Wushu, which is a far better way to describe basic Chinese Martial Arts.

I disagree that kung fu is more effective than other arts. Not only because it is the practitioner that makes the art, but because there are merits inall.
You cannot claim that jiujitsu is inferior as a grappling art to chin ma.
And you cannot say that escrima has inferior knife techniques.
There is a lot to be learned from all arts.
What makes kung fu effctive, is that it relies on principles not on uncoordinated techniques.
Kung fu systems are exactly that systems, not a set of blocks and strikes, they are left open for interpretation and adaptation, that is what makes them good.

kungfu covers a large area of chinese martial arts, its hard to specify any forms or styles. japanese and korean martial arts are basically derived from chinese martial arts.because of cultural differences, their "original quality" changes. therefore, japanese and korean martial arts are more rigid in terms that almost everything is fixed and cannot be changed. whereas, the mastery of chinese martial art is based on the understandin of the individual which allows flexibility in the use of art.