Just to set some things straight...
- From a Dark Souls player, this game is pretty easy. Harder than the average game, but much easier than Dark Souls, especially Dark Souls 2.
- The load times suck, but a patch is coming to fix that.
- The Regain system isn't all that it was cracked up to be. Dark Souls players won't even notice it's there most of the time.
- Boss are super easy, especially compared to Dark Souls.
Any questions I'll be happy to answer.
I'm also working on a guide for anyone who needs help:
http://www.usgamer.net/articles/bloodborne-tips-walkthrough-and-boss-battle-guide