I remember when the server went to hell. First the gold duping then the outright hacking. However, since Nexon's cracked down on it, it's a much better place.
I had just learned how to do it and really wanted to try it out. :c
And yeah, no level cap. But the game makes sure that it's got challenging enough stuff around, so that the game doesn't become a 1-hit fest for people who are 500+.
One dungeon actually recommends that you be 1k before taking it on solo. It's doable with 8 people, though if you can somehow find a pass for 8.