It's possible that the game is just not for you. I think that the question you're asking is highly subjective, I can only offer my own personal experience with the series. When I first started playing Demon's Souls, the initial difficulty curve was pretty intimidating, but with some practice I caught up to it. The sensation of being able to read the environment and contemplate a plan that leads to survival is pretty satisfying after successfully executing it. Once you've practiced up to the initial difficulty, the game doesn't get a whole lot harder from there. It'll increase in difficulty a little bit, but not in such a way that you'll find yourself being outmatched by what you're encountering repeatedly. It's a game where the reward is all in overcoming its adversity. Dying will always be part of it, just fyi.