Why is Dark Souls 2 so Polarizing?

I've yet to play the game, but I'm close to finishing DS1 and plan to move on to DS2 right after.

From what I've seen, it seems to be the consensus worst of the soulsbourne games according to the community. At the same time though, it also seems to be a lot of people's favorite. I hardly ever see it as a middle choice for anyone.

So basically my question is, what is it about Dark Souls 2 that some people love so much, while others hate it?

Edit: Hate is probably too strong of a word. I just mean least liked.