It sounds like an unscheduled autoFX rather than an engine failure (although the end result is the same). I would be worried if any pilot (training captain or not) couldn't fly an approach (whatever type) on profile. ILS would not have given any advantage unless conditions were particularly poxy. It sounds like unscheduled autofeather is a fairly common complaint on the type, Air Nelson have already had one on their Q300 fleet after less than a year of service.
With respect to nearly blowing a tire due to high approach speed, that doesn't make a lot of sense in a Dash, unless it was the nosewheel
