Demon Soul's is the best within the souls games. It has the strongest plot. The backdrop justifies everything pondered or not pondered. It's hard but not very hard. Keep trying and it'll lead to success.
Bosses have personality despite not looking like they have one. The story is engrossing, the gameplay, like the story, is similiary fantastic. It's highly reccomended you play Demon Souls. It's full of different places all of which are non-linear. Scenery is vast, detailed and textured. It's ahead of many titles.
The weapons are cool too. In conclusion it's one of the more stronger contenders for best ps3 game.