In the final accounting: Dark > Demon's >> Dark 2. Didn't play Bloodborne yet, no PS4. But I like Dark 2 more than most other games so I wouldn't call it bad. Just less special than the others.
DS2 is clearly inferior to DS1 atmosphere/lore-wise, no doubt about that. Regarding other things... Well, I think both games have a lot of problems.
Gaping dragon is cool? Not in my book. I mean it looks cool, but it's a very boring and repetitive fight. You just bait it into doing a head-slam attack, hit it, repeat. Nothing remarkable about that.
And same can be said about a lot of other DS1 bosses. They may look intriguing (so do many of the DS2 bosses, btw), but they aren't really interesting to fight. Ceaseless, Centipede, Bed of chaos, Pinwheel, Butterfly, Iron Golem, Nito, Seath, tons of identical demons with giant butts and so on. I really didn't like those fights. Some of the areas in DS1 are just as bad. The whole lava level is a nightmare, for example, in a bad way. So are the catacombs and some other zones.
DS2 has a way bigger list of problems, of course. Too many bonfires (Forest doesn't need 4 fucking bonfires, it should have 1), too many enemies, too many items, bosses in the main game are horrible with the exception of a few, lack of atmosphere, questionable design and so on. But man, every run looks and feels so different, there are so many builds and options you can use both in PVE and PVP which is, btw, ten times better. Because of that I've already played this game for 400 hours,and ds1 I completed maybe 2 times. Sorry, I can only enjoy atmosphere so much. It's simply not as interesting to engage and kill enemies in Lordran as it is in Drangleic.
People complaining about tracking, Yeah, it's cheap. But stop circling around and fishing for backstabs. It's no DS1. Use rolls, backstep and parry.
People complaining about magic in the dlc.
This guy has done tons of runs. His current one is a pure magic run. He's cleared the first two dlc already. It's not that bad. Third one might be a bitch though.