It was just a random choice for me. The dojang looked good, and the teachers/masters/etc. were really good at the place I started. I began to love the art of TKD through its forms, its emphasis on what is the most powerful muscles in the human body for use in combat (the legs). Also, I've noticed and studied some really good TKD styles that end up being blended with other arts (particularly Hapkido, Jiujitsu, Judo, and I've even been in one that mixed in some obscure Chinese styles) to avoid becoming mere sport. If nothing else, it's a very good entry art. It forces you to develop flexibility and leg strength, which any good martial arts style can make use of.
Also, I just love the style. My legwork remains a point of pride with me, for better or worse, and I can honestly say that I like that emphasis on kicks and jumps in combat... it lends itself to my somewhat unorthodox personal style (I've mixed in all sorts of weird stuff in that regard). In many regards, it's also just a beautiful style to WATCH, and to know that you can do. Similar to Capoeira in that regard. A really good TKD artist usually has the technique and flexibility to execute moves that look beautiful, and if he's trained right (and I think I and some of the other TKD stylists here have been), that MAist will have some of the most dangerous feet in the world. (forgive me, I'm confident)
However, TKD is not all peaches and cream. I've seen a few McDojangs myself. I've also seen many styles that place emphasis on kicks to such an extreme degree that there is nothing else mixed in, and the fighter isn't effective on the streets. I've also seen the opposite extreme, where kicks are secondary to punches, or are taught to be used ineffectively.
Overall, TKD has a lot of potential to develop an artist's flexibility, endurance, and lower body strength. It also helps develop the kicking technique to use that half of a person's body to good effect in a fight. Just like any art, it has its problems, but overall... I'm still very much in love with the ART of Tae Kwon Do, and I probably always will be.
--Cliarlaoch