What footage are people watching? what I've seen the odd person has been a bit jittery but the main core of crew was fully functional and running it by the numbers to drill.
Academically it would be interesting to see the outcome - those Type 45s if properly equipped and competently crewed have vast ability to jam, evade and hard kill ballistic threats in large numbers - can deal with at least 30 anti-ship missiles in a swarm* (plus whatever CIWS manages - which is a bit contentious) has home-on-jam defeats and ability to disrupt command designation of peeking missile swarms. An attacker is likely going to have to accept significant losses to take one out as you need to be able to designate it as a target to hit it. The bigger vulnerability is likely going to be to submarines/torpedoes in a situation like that as any ASW heli is going to be extremely vulnerable in the air both from hostile action and potentially even friendly countermeasures.
Obviously reality generally isn't like the movies or top trumps stats wise but down to the actual efficiency of the hardware and competency of the people using it and things like acquiring and tracking a target doesn't work like it does in games or movies.
* Even if 100s are launched against it, not all of them are going to be actual on target threats and the Type 45 can track and prioritise those.