You know what makes Nier's success (both critical and commercial) even more impressive? The fact that it was made in less than 2 years. When the game was announced in E3 2015, the only things that they had to show were concept arts. It was the announcement of a Nier project between SE and PG, that at the time didn't even had a name. Now less than 2 years later, we are here.
Just think about it for a second. How many big console games in the current generation (or even PS3/X360 generation) can you name that A) had a small budget B) less than 2 years of development time, and yet still managed to (arguably) be a masterpiece.
Neir Automata is seriously impressive on so many levels.