You are gonna rage so hard the first time you get invaded by a black phantom.
Ok some bulletpoints:
- Stamina - You ever been in a sword fight? I have, it's tiring. Rolling about also wears you out in reality and I can't imagine how tiring it would be whilst wearing armor.
- Dying lots - You simply have to be really careful, Ramboing in Demon's Souls will get you killed. I admit at times it can be really unfair when you die but hell, I bought the game because I heard it was hard so I can't really complain now, can I?
- Storyline - You're right, there isn't much of one, it basically comes down to the kingdom being overrun by an evil entity and you are one of many idiots who decided he could kick the big bad guys ass, you are nothing special, just another guy.
I'll give you some tips on how to play the game well:
- Go slow, try to get as few enemies as possible in each fight and beware of traps, if you are online (very much recommended) watch out for signs left on the floor, they can give you forewarning of ambushes or traps.
- After defeating Phalanx (first boss, big turd monster) you can start using your blue eye stone to get summoned into someone elses world, this will get you souls and give you back your body if you defeat the boss you have been summoned to help with.
- Only block when you have to, it slows down stamina regeneration.
- If you get really frustrated turn the system off, you don't want to be dying lots because you're throwing yourself at the enemy.