Demon's Souls is super cool, but I was never able to finish it despite beating all of the other Souls games. The controls were just way too clunky and springy (a problem I also have with Dark Souls 1. It's fast, but stiff, and the weird bouncy roll kills me). I have an extremely hard time going back to pre-DS2, because losing 360 degree rolling while locked just hurts too much. I can play unlocked when I need to, but doing it all the time isn't as fun for me.
I'm honestly done with Souls for now though, I played through DS2 too many times and found 3 super underwhelming. Bring back Lost Kingdoms or King's Field, FromSoft!