Horizon Zero Dawn is a masterpiece in my opinion. The story is engaging, the world and set up is interesting and unique, voice acting is top class, it's utterly gorgeous with both superb graphics and design style and the gameplay is quick paced, dynamic, variable and challenging.
Aloy as a protagonists is one of the most empowering, entertaining and relatable I've ever played and being voiced by Ashley Burch doesn't exactly hurt either. I just adore the character. So witty, courageous, determined and adventurous it's just impossible to not want to follow her story to the end.
The open world and RPG elements of the game aren't exactly complex nor very original, but offer enough variety, flexibility and fun to be worth while. These have been integrated well and feel indigenous despite the fact that these ideas have been done before.
I love the variety of enimies, such cool deigns that require strategy as well as skill and timing to take down. Unlike other games (I'm not gonna say what game is on my mind because you'll all just crusify for it) that cripples you with sluggish controls and cryptic AI that prays on your natural instics, this game has fast, intuitive user input in combat and AI that offers a fair challenge without trying to trick you. This is important as you own every victory and defeat making the game challenging without being frustrating.
Overall, I love it. Been playing games for the best part of three decades and this is one of my very favourites.