I checked in on a couple of Bloodborne vids and as much as I wish I was interested, I'm just not.
For reference, I played Dark Souls for 15-20 hours or so and was bored. I didn't find the game particularly hard (although certainly not too easy) but I just didn't enjoy any of the game mechanics or controls. I really liked some of the concepts put forward by the game (the way the game handled death/consequences, the open world, the attempt at "fair" combat) but ultimately felt the game lacked all charm and atmosphere.
Combat in Dark Souls is verrrrry limited, which for many is it's charm. From the 2 hours or so of gameplay I've seen of Bloodborne, it seems more of the same. Rolling, stabbing, rolling, stabbing, run-away-heal-repeat, still seems to be the typical style of combat. It's just not for me. Combat feels like a zombie-survival game... not a lot of combos, or flair, just swing whatever ridiculous looking weapon you've gotten your hands on and roll around a whole bunch. Yes there are new parry/riposte abilities but the don't look wonderfully implemented to me, at least early on in the game.
The story is presented similarly as it was in Dark Souls... it is up to the player to seek out very small bits and pieces of information to try and figure out what's going on.... the problem being (for me) that none of it is very interesting. None of the player actions seem to have any impact on any characters in the game or the game environment and (by design) the game is extremely sparse of anything other than charmless undead enemies.
It's a zombie game where you traverse a maze from points A-Z with no interaction with any real story/charm along the way. If you don't enjoy the gameplay/combat as you go, prepare to be bored. But if you love zombies and the same combat from Dark Souls than Bloodborne is about the best game you could ever have, so to each their own.