I enjoyed teakwondo as a child. Im built for it as it is leg focused martial art. Being tall and mostly leg my kicks looked great and I could develope a lot of power in them for my size. If the instructor hadnt of insulted me after winning some large trophies I would of stayed with it.
It can be used in rl ssituations if need be so long as you keep your wits about you. Thats the biggest determining factor imo.