Just to play devils advocate here in relation to the THY crash.
Much has been made here about the length of time that the throttles were at idle and that the crew should have been aware of the fact. Wasn't it the case that the GS intercept was from above and consequently it was likely that the throttles would have been at idle during that time?
Wasn't it also possible that the speed was decaying, initially from above Vref so again the crew would not have been surprised to see that situation? Yes, they should have noticed that it was falling below Vref and IIRC the FO did as the throttles were manually pushed up but he then let them go and they retarded to idle yet again.
I don't disagree that there was a lot that was wrong in the cockpit that day (systems knowledge; cockpit gradient etc.) but I think the time that the crew had to realise something wasn't right was a lot shorter than most have thought. However, I don't fly a 738 and quite happy to be proven wrong.