Demon's Souls is probably the best game I've ever played. I can't think of any game that has been so immersive as it was. I'm really looking forward to the spiritual sequel
Project Dark.
Teaser
I do think the difficulty is exaggerated, I made it through without summoning blues (except for Old King). I was just careful and didn't try to go God of War on anyone.
My class was Paladin and I've finished the game twice with that character.