Lack of fast travel, lack of boss "souls" to make new items, return to dumb grinding for healing items like in DeS, lack of ways to play the game(no matter your equip you fight everything the same), weak bosses, lack of varying art design, less than half the weapons, armor, items, lack of upgradable armor, less bosses, lack of equip load, half the stats, linier world(outside of a few sidequest you just go point a to point b there is no part where you choose which way to go), load times, texture popping, lack of interactavle npcs, lack of respec, lack of ASKING YOU if you want to move to NG+, & so on.
Gameplay is far less strategic due to the regen mechanic you can just keep mashing against slightly weaker enemies & never worry about dying. How about the fact all viceral attacks are the same instead of unique animations per weapon type like the previous game? The list is infinite how much is NOT in this game. Every system mechanic was either dialed back or removed from previous Souls games. Wanna Duel wield? Better get that ONE weapon that allows that. What's power stance? Never heard of it. Stronger healing items? You can only carry one, go back & farm more Bloodviles in Central. The game is so boring once you get to NG+ cause there is nothing else to do. No stronger new enemies, no new drastically different builds to attempt, no new attacks from bosses, nothing. All it is is the same enemies but more health & they do more damage. Also bo bonfire aestic equivalent either. Sorry, the game lacks content ESPECIALLY when compared to Dark Souls 2.