AnFI, the training (think Ex Clockwork in the Norwegian Arctic, for starters) was way up there with anything then available around the world. The crews knew their kit, knew their limitations but also knew that if they did nothing then the untimely demise of the ground troops was assured. They went out, did their best and - ultimately, albeit expensively in terms of airframes lost - achieved their aim.
...ISTR it didn't do one of them any harm, he has so far risen to 3* rank in his parent service (which isn't RN).