Just to make another point a correct ident does not in all cases mean the ILS is reliable.
We always make it standard practice to usually confirm the Glideslope intercept DME point if available against the altimeter so for instance if you are at a platform of 2500 feet and the glideslope intercept is at (just using a round figure) 6 DME on a chart! Then its easy to check one against the other. You then know your altimeter is set at the right figure and that the glide is correct.
Make a further check at around 1500 feet or nearest again against a chart depicted point and you know you are on the right glide. Don't just blindly fly a glide without backing it up an this appears to be the case with this crew until late in the descent so not really such good airmanship by the crew!
Pace