All the photorealistic graphics in the world can instantly be ruined when the player cant do something they feel fits within the game world. As gamers we understand a few of these problems, they happen. But when it keeps happening time and time again, it slowly chips away at the illusion. The illusion that were are exploring islands, slaying demons or solving mysteries, and isnt that illusion the reason we play games anyway?
Source: N4G PC Stop Making Obstacles I Could Clearly Walk Over!