The post you are reporting:
Some details from the manufacturers website that I put above that will answer most of these negative comments -
"An automated external defibrillator is used in cases of life threatening cardiac arrhythmias which lead to cardiac arrest. The rhythms that the device will treat are usually limited to:
1.Pulseless Ventricular tachycardia (shortened to VT or V-Tach) [1]
2.Ventricular fibrillation (shortened to VF or V-Fib)
AEDs, like all defibrillators, are not designed to shock asystole ('flat line' patterns) as this will not have a positive clinical outcome. The asystolic patient only has a chance of survival if, through a combination of CPR and cardiac stimulant drugs, one of the shockable rhythms can be established, which makes it imperative for CPR to be carried out prior to the arrival of a defibrillator.
Automatic refers to the unit's ability to autonomously analyse the patient's condition, and to assist this, the vast majority of units have spoken prompts, and some may also have visual displays to instruct the user.
The location of a public access AED should take in to account where large groups of people gather, regardless of age or activity. Children as well as adults may fall victim to sudden cardiac arrest (SCA)
When these protective cases are opened or the defibrillator is removed, some will sound a buzzer to alert nearby staff to their removal, though this does not necessarily summon emergency services."
And if you look at the outside of the box the sequence is explained - dial 999, do CPR, use the AED if it's needed in that order. The device will analyse the patients heart rhythm first and if it's not appropriate to use it then it won't work.