Outside of duels, most melee fights have multiple people in them. Due to the block delay, attack delay, and directional shield blocking, in addition to the stun, if you're stuck in a 1vX fight against players of moderate skill or higher, you just get stunned to death with no hope of survival. In Warband, fighting multiple people was difficult and usually involved you dying, but at least there were avenues available to skilled players, who found themselves in that situation, to survive or win. Now it's an autoloss if they don't teamhit each other. Skill is the primary factor still, but you're more shackled to poorly designed/implemented game mechanics outside your control than before that makes many situations downright unplayable.