The Souls franchise is built on the concept of its unique co-op gameplay. NOTHING else on the market compares to it.
There's a fantastic element that you can co-op your way through a level, or get invaded at any moment. I think it's interesting that you can be invaded anytime now, though (a) I worry about network performance - the beta will tell about this, and (b) I don't love the idea of being invaded ruthlessly before I've had much time to figure out the new game.
However, I don't love the idea that I have a time limit with blue phantoms. It's MY gameplay experience, why am I being limited? If I want the phantom to carry me, so be it (I don't play that way, but I support others who do).
What if I want help figuring out how to traverse a level? Nope. What if there's some secrets or hidden treasure I didn't find? Too bad. What if I just want to hang out with friends and party through a level together? Gone.
I appreciate that maybe it's too much of a network strain to keep a connection open that long, but From doesn't have a spectacular record with network connectivity anyway.
What is the advantage here?