I love Dark Souls 2 and consider it to be the worst souls game, but still a great game. Dark Souls 2 has lots of stuff around the periphery of the game that is better than its predecessors, stuff that you go back to Demon's and Dark souls and you're like "oh damn, using multiple souls isn't in this one".
I personally don't think there's any solid thing that draws it down, and I think the DLC for Dark Souls 2 is some of the best content in any souls game (Bloodborne included). But in the main game, I feel like the level design is just not as good. It's not as fun, not as clever, and not as rewarding. Trying to put that articulation in words is really difficult, though.
I also think if you're calling it bad because it's difficult, then you should go back and try again if you haven't already. Try a different playstyle or different stats, because it really isn't that hard.