Bloodborne is a shadow of a Souls game. It's pretty good for what it is, but it doesn't compare to the other games, which offer everything Bloodborne does and more.
Dark Souls 2: Scholar of the First Sin is the best, Demon's Souls is my favorite, Dark Souls is mostly a rehash of Demon's, and Bloodborne is a fairly fruitless deconstruction of the formula.
I think Bloodborne has something the other games don't, I just find the feel of the combat better in every single way. Combat in the souls games became kind of rote after a while because all you did was bait attacks behind a shield and then strike.
That said though, I think I might agree with DkS2: SFS being the best of them all. Just the scope of the game with the dlc is huge, and the difficulty level is superb playing a dual wield spec.