Nioh is an action-RPG, featuring very intense Souls-like combat and offers rewarding exploration in a Japanese-themed game world.
Pro Rewarding exploration
Exploring in Nioh feels worthwhile since it helps you find new equipment and rare materials. This will help progress your character, allowing you to defeat enemies in fewer hits and giving you a smoother playthrough overall. It's also very exciting to accidentally stumble upon secret areas.
Pro Fast-paced, intense combat
Nioh is a very fast-paced game, which also rewards awareness and patience. The combat in it is all about dodging, countering enemy attacks, and looking for openings. You will quickly regret any hasty decisions (like fighting three demon Samurai out in the open) since they'll most likely lead to your death.
It also features some very intense boss fights that further expand upon this core concept. The fights are much longer and requires you to focus the entire time. Nothing beats the sense of accomplishment when you finally beat a giant mythical demon.
Con Punishing difficulty for beginners of the genre
Nioh, like any other Souls-like title, has a very brutal entry difficulty. If you're new to the Souls-like genre, you'll have to get used to a lot of the mechanics, dodging, and, most importantly, dying. This can be the source of extreme frustration for the first ten hours or so, which causes a lot of players to quit during that time. If you can get over this initial hurdle, you'll finally start enjoying the game. The acquired skills will also carry over to other games in the same genre.
Con Min-maxing meta-(end)game
You either oneshot everything or end up being oneshotted. Heavy reliant on buff/debuff and status effects arrangement, sometimes even exploits to overcome punishing unfairness of the game mechanics. Although you're free to complete vanilla story more or less casually.