I've yet to see anyone directly complain about difficulty. Every complaint thread seems to revolve around: Shitty random number generator that determines number of ???floors / floor type (*read lamps), Shitty random number generator that gives horrible 1/300 drop rates. Shitty timed events where there is not enough time to do the task at hand (ie the monsters are of sufficient difficulty, but the time limit is too low), quests that require you to collect enormous amounts of X-item (again, not difficult, just incredibly boring).