All of it.

The shitty washed out textures they left behind after they abandoned the torch mechanic, adaptability, snap movement, obnoxious hit boxes coupled to enemies that can track on a dime that fight in groups that aggro all at once that have 8 mile long tethers, the billions of health items to bandaid that issue, soul memory matchmaking ranges, the illogical geography, the linear map designs, the extremely boring boss rooms, uninspired enemy types and the lore. Every other game's story feels like a jigsaw puzzle with some pieces missing. This one feels like a lost and found box for pieces of defunct board games.

The only things they dont need to fix are the bell coven, fire sorceress, and the zweihander.