ReimTime on 08 May 2015
Honestly that is a fairly high number for a trophy percentage, in comparison to other games, seeing that it is till fairly new. Another thing to take into consideration is that not everyone can be bothered to sync their trophies to the online server (does anyone know if you have to sync to be counted?). But even without those pieces, many people don't care enough to finish games; especially when they just watch the ending on YouTube, like you said.
Here are a few games I pulled at random that can be comparable
Mirror's Edge: 29%
Portal 2: 40%
Bioshock: 36%
God of War 3: 50%
Uncharted 2: 45%
#1 Amb-ass-ador
