Hi,
Lots of comments here, so i'll just snap reply them with my own views.
When i talk of martial arts, I'm actually referring to "real, practical martial arts" not wayang arts like fighting in the ring or exhibitions. There are martial arts very effective for real life self-defense, like krav maga, Xinyi quan, kickboxing, boxing etc.
Some of you are condemning the TKD and other schools here. I think there's no such thing as "a martial art is lousy", but "a martial ARTIST is lousy". I bet at the old, traditional level, TKD can be very effective, but maybe the schools here teach watered-down versions.
Tai chi is orginally a martial art. The type practised by old folks at comm centres is a watered-down version.
Part of real martial art is conditioning yourself to take a hit. So, it's true, if you can't take a hit you suck. Qi gong and physical conditioning do that for you. At the highest level, you don't even need to "store power" for the qi to protect you at any point. But it'll take decades to hit that level unless you train full time.
It's true that people (girls) aren't generally impressed by any expertise in martial art. Many girls hate it if you get into fights outside. That's why it should be approached as an art you practice for self-development and last resort defense, not to get into fights.
What you said is quite true. It is not whether the martial art is good, but if the person can master it.
Additionally Qi itself exists in all of us. I believe some people call it life force and different culture has slightly different concept on Qi. Some culture can even present the Qi in colour, eg, Yogi in India believes on Charkras and can see different lights emitting from each charkras.
Even in the West, portraits of saints are displayed with halos on their head. equating with the Charkras in India, it indicates development in the spiritual area.