Pro Fast-paced and action packed combat
The combat in NieR: Automata is incredible. It has a very hack-and-slash feel to it, with an emphasis on agility and acrobatics. You will have to switch from using small, quick jabs with your weapon, to devastatingly strong attacks, and again to utilizing ranged attacks, as well as the companion that follows you around if you want to have any hope of surviving every encounter. It can be very difficult to win battles sometimes, but it also feels equally rewarding when you finally achieve victory.
Pro A unique take on storytelling leads to a very entertaining experience
NieR: Automata's outlook on storytelling is great: in order to get the full experience, you've got to do multiple playthroughs of the game. You unlock more chapters of the story as you complete the previous chapters more times: completing the first chapter twice will until the second chapter, then when you complete that you unlock the third.
When you begin, you play as an android known as YoRHA. However, subsequent playthroughs will allow you to choose different characters and experience the story from a different perspective. It's really interesting and certainly serves to make the game more fun overall.
Pro It's got a hauntingly beautiful environment
NieR: Automata is set in an apocalyptic time where earth has been overrun by robots, and the artists really nailed what that would feel like. Abandoned and overgrown cities litter the landscape along with old refineries, graveyards, and eerie forests. When you add the beautiful soundtrack to the experience, it fills you with this: you are alone... but there is hope.