Bloodborne excels in every aspect. The gameplay is fun and intense, the lore is interesting and it has an amazing soundtrack.

In the beginning all you know is that you have to hunt down the beasts that roam Yharnam's streets, but as you progress, you start to discover a lot more about the dark, grim and tragic story of the plague-ridden city and its residents.
The game has such an amazing atmosphere. Perfect worldbuilding

The bosses are really well designed (there are a few exceptions) and they are fair. There are fights against huge beasts and other hunters. When you fight a hunter boss it almost feels like an elegant dance with them as you attack each other and quickstep around in the arena.

Finally, the soundtrack of the game is brilliant. It really fits the game and makes the bosses even better.