Mostly because I never got into demon souls, but also because I believe games shouldn't be carbon copies of each other, even if it is a sequel.
So if they make an FPS one game the sequel should be an RPG and then the next sequel should be a racing game? I'm not sure what you mean by carbon copies, they have the same root elements because they are the same genre and same series. You are making absolutely no sense to be honest.
Also I love how this game is filled with secrets that you really need to be paying attention and think about to access, like shooting the dragon tail you see swinging on the way up to Undead Parish and after shooting it 15 times it falls off and you get the bad ass sword. I miss games with secrets that are really hard to find out about and this game is chock-full of them.