I'm not a FromSoft aficionado and have only played Bloodborne for about 10 hours, which I enjoyed but probably would never finish. I've followed all the Souls games and now ER, have watched many hours of gameplay, and I honestly don't get the appeal and cult-like following around them.
I can appreciate the detailed environments and characters, the deep lore, RPG aspects, and probably the best combat mechanics and hitbox detection in the industry.
What turns me off is that the entire gameplay loop consists of boss rushes and fighting lower level enemies, just so you can gather loot, level up and fight more enemies and more difficult bosses. It all feels very one dimensional, and before ER introduced the open world aspect, very linear.
I suppose most games can be boiled down to their essence like this and sound boring, but in a game like Fallout 4, BoTW or Skyrim there's much more to do than just combat, crafting, leveling up and exploring. There's a quest system, cooking, companions, horses (the one in ER seems just for traversal?), challenges, complex NPC interactions, branching storylines, etc. They offer a much richer experience than any Soulsborne title I've played or seen.
My impression before ER is that all Soulsborne titles are essentially minor improvements on the same formula, with a lore and environment swap. ER introduces the open world aspect, but ultimately keeps the one dimensional gameplay loop.
I'd love to be proven wrong, and get the appeal of these games, so please correct anything I'm mistaken about above. I don't even have a problem with the difficulty curve if the game would give me reasons to keep playing and git gud. It's just that it doesn't, so the high difficulty is frustrating enough to stop playing.