I personnally have played ranked taekwons as main character ever since they were added into the game. I just love doing missions. I did well over 500 missions if I add them all up, from a few different servers.
One of the reasons I love doing missions is that I get to fight monsters on different maps all the time. I'm someone who hates staying at the same place for a long time, so it suits me extremely well. And I tend to get all types of rares, not just rares from the same few maps. It's kinda fun.
For those who don't know, taekwons get a skill called Taekwon Mission, which requires you to kill a randomly assigned monster 100 times. Once that's done, you get one point. The top 10 taekwons with the most points get special bonuses : they can chain their kicks (that makes for great damage), and at level 90 and over, they get all the taekwon skills unlocked and maxed, and tripled HP/SP.