Automatic critical hit limitations

If I were to use an attack that guarantees a critical hit, such as Wild Blow, will I still land a critical hit if:
1) I am hexed with Dulled Weapon?
2) I attack a foe enchanted with Stoneflesh Aura?

No, not if the skills behave the way they're supposed to. No matter how wildly you swing your weapon, it won't matter if it is dull or hits a rock.

I believe not.

the general rule for any game is "cannot" modifiers beat "can" modifiers.
guild wars is no exception.

will not be a critical hit, however i believe it still counts as one for critical agility and such