uhh i don't know dragon nest but I think the difficulty level is appropiate
i've only played until lv 26 (max is 45 currently) and I think it's not too hard and not too easy pve and dungeon wise
the big end-dungeons at the end of a map are pretty badass . I tried with a 3-person party and we were recked haha we tried multiple times and even got a forth member later but still didn't manage the end boss, even with dragon coil .
or we were just bad ;O;
but that was shortly after open release of the game, now everything has cooled down a bit, people have more experience etc