Trabzon is not the easiest place, with a 3.3 degree glide, often TWC as you pass the valley on approach, short runway 2640M and non-standard runway markings. Normally in marginal conditions you would land F40 which is the 738 would be approx 130- 140 KTS depending on weight. The runway at TBN has a grooved section assist stopping. Having said all this technical stuff the real issue is the Pegasus culture: High Speed, always requesting shortcuts, requesting visuals in ridiculous scenarios and a proven track record of busting minima to land. The minima is either 600, 590, or 490 depending on GA %, normally operators use 600 which is 2.5% or 590 which is 3.5%. Unfortunately this looks like another case of busting minima, landing deep and the rest is history. As observed a little more energy and it could be world headlines.
This Turkish site has all the gritty pics, including the engine recovered from the sea ( or locals would have sold it in the bazar! )
http://www.airporthaber.com/pegasus-...e-firladi.html