Why is it hard to believe, this is id Tech 5. The engine runs really well, but it looks like ass. Just look at Rage with it's 20GB install on PC with textures that looked like something out of the PS2 era. Adding a bit more than double the data size is going to improve the texture resolution, but only by so much. The Evil Within is going to suffer the same fate, and then we can all hope that id Tech 5 is gone for good after that.
That's hyperbole. It's not even close to PS2, and looks pretty decent. It's just took big.