What is Demons Souls?
Its a third person RPG where you control one character, somewhat like if Elder Scrolls was third person. You pick a character class and journey through different worlds to rid the land of demons. The atmosphere is very dark.
Why should I play it?
1. Genuine difficulty and challenge, that is fair. The game is brutal, but you learn quickly.
2. Controls as smooth as butter. Light attacks, heavy attacks, parrying, counterattacking, backstepping, and dodging are all incredibly fluid and make the game very fun to play. I played Oblivion and thought it felt clunky, which partially made me give up on it.
3. None of the fluff in other Western RPGs, like quests. You have some merchants, but you won't spend time fetching 12 fish to get powerful armor or weapons.
4. Most unique and inventive online system I've seen. If you're connected, you see white ghosts of other people playing the game at the same time as you. You can leave messages on the ground for other players (like "Dont proceed without fire protection"), and you can touch bloodstains of other players to see the last ten seconds of their life. More interestingly, you can summon other players to help you and other players can invade your game and kill you
. Its also very satisfying to kill somebody who invades your game.
Also, boss designs are crazy. Designs like this: http://img15.imageshack.us/img15/4409/adjudicator.jpg