Bloodborne is an extremely difficult action RPG. It's heavily inspired by Lovecraftian horror.
Pro Excellent world design
This game takes place in a Gothic, Victorian era (1800s Europe) inspired city. The buildings are dark and tall, instilling in you a sense of awe and fear.
The environments are very detailed, reminding you it was a thriving city before all went wrong.
All of these elements fit the Lovecraftian horror theme really well.
Pro Great bosses
Bosses in most games nowadays hardly ever give the player any challenge. Bloodborne is an exception, with bosses being a test of focus and skill.
You'll have to constantly move around, attack openings, read tells to dodge attacks, and choose proper positioning. Beating one of these beasts after a long and exhausting struggle is extremely satisfying.
Pro Frantic combat
In the world of Bloodborne you're never safe. Each location is filled with fast and ruthless enemies that will constantly try to kill you. It can be infected humans, werewolves, and even demonic beasts. You'll have to constantly attack and dodge at a very fast pace, and losing focus for even a second means you'll die. It's the type of combat where you'll steadily improve with practice, making it feel rewarding when you get the hang of it.
Con Incredibly frustrating at times
You'll most likely die a lot, especially while you're still getting used to the game. It can happen on both regular enemies and bosses, with the latter being a lot more frustrating. Dying at a boss means you have to fight your way back to the boss room. If you're too agitated you might even die without reaching that boss again, which adds even more to the frustration. This pattern will repeat many times over the course of the game.
Con Framerate pacing issues
The game engine often produces two unique frames followed by two duplicates instead of one after another. This makes it seem like there are frame-rate drops even though the game runs at a stable 30 fps. The gameplay doesn't feel smooth because of it, which can be quite distracting.