I have. Your arguments implied that they cannot, in any way, make Dynamic Events difficult because of the openness of the events and the random player factor (frostbolting jerk off in the back), seemingly ignoring that the events in the demo were scaled down in difficulty to accommodate demo players and allow Arena Net to show off their game, and the fact that Arena Net has designed their events with the possibility of failure in mind.
You also argued that Arena Net can't really make a difficult encounter because of your experience in the Elite areas of GW1, whereas they might not have been difficult for you, but for the vast majority they were.