Outright Villainy
Member
Demon's Souls has some big advantages over Dark Souls. The level design is consistently good, with none of the Lost Izalith-style big boring areas with nothing in them. The game feels more finished, with no boss fights that are break the mechanics like the Centipede Demon. I like the tone and atmosphere of both games, but Demon's Souls has a different style that may appeal to some people more with its gloomy greyness.
I prefer Dark Souls by a large margin, but Demon's also had a better risk-reward system with going human; by giving you extra health and not just unreliable coop, it was a real incentive to go human and take the invasion risk that goes with that.
Of course it was a little undermined by the harsh tendency punishment so I just stayed in spirit form anyway, but giving more health in human form is something that definitely needs to come back for DS2, especially so we can get more people whining about forced pvp. Sweet delicious tears.