What is it with the boss fights?

Rafael: Fun fight
Cazador: Had to save scum so Astarion dosen't die. (At least make it clear that he dies after a certain ammount of turns at the start, please!)
Orin: A complete joke. Like I had fights against random guards that where harder.
House of Grief: Basically impossible. Rare and legendary equipment, buff up entire party before the fight, use elixiers, coat weapons, summon elementals and everything... There are like 987452 million enemies, all do a crap load of dmg and cast fucking darkness that deals necrotic damage, so I can't see shit and attack nothing and they all murder me before it's even my turn. I'd need an entire party with like 12 initiative even stand a chance.