Severe break down on both parts - As pilot flying you are expected to be able to visually fly a serviceable aircraft down to the runway and land safely in the designated touchdown zone, instrument assisted is a bonus! If you can't get the basics right what are you doing there!? As pilot monitoring in a 2 crew environment you are there to advise the pilot flying of any deviations; whether that's glide slope/localiser deviations from an ILS or height checks on a LOC only or VOR approach.. How did these guys manage to hit the ground so short!?
Having relief crew in the cockpit for landing should be a bonus and they should obviously call out anything they see that isn't right!! Why do so many airlines stipulate that on long haul flights all 4/3 crew members must be in the cockpit for takeoff and landing!? This accident could have been a lot worse and if it was all to 'save face' then anyone who won't speak up about deviations in flight path purely to save face shouldn't be there in the first place! Do they not have CRM training at Asiana??