I've always played in Khaini; although it is the most populated with hackers/bots(from what I've heard. I see bots regularly though) you only see them in the first channel.
I've gone through at least three main characters in my time on the game. First was a normal bowman; whom I screwed over completely. Second was a Fire/Poison Wizard whom I got bored of fast. After that I took a 2-year hiatus thinking I would never play the game again.
Unfortunately for that guess, my little brother is obsessed with the game and finally was allowed to start playing it again. After seeing a few of the newer features, I tried it out with a new Bowman (Cygnus Knight/Wind Archer) and got to level 30 in a matter of days. Alot faster then my previous tries.
The only thing I like to do is collect Medals(exploration and other objectives) and a new type of monster card for a encyclopedia-type book. Fighting gets old fast.
Personally, I find it a waste of time, but I have to much freetime to kill.