I stopped playing too. I really loved the first part of the game when it was just about traversing the world, doing courier work and avoiding threats, but I quit when it became a game with 'boss battles'

Something especially frustrating was that every gun had a blood ammo type for attacking BTs but the best method for nearly the entire game was to sneak and throw blood grenades instead. Then you get the cuff blade thing and the sneaking is still better. The only real depth to it is that I learned you can intentionally trigger the fights to farm chirillium.