If the hammerfisting frustrates you because you get hit hard, then it isn't pretty easy, right?

Pretty easy means you had an easy time finishing it, never getting frustrated, at cheap bosses or wonky controls, since both of those affect the difficulty of the game.

For example, cheap ambushes and wonky controls/camera/hitboxes are part of Dark Souls' difficulty. They might not be intentional, but it still does not change the fact that it makes the game more difficult to finish.