I completely avoided true multiplayer in Demon's Souls, but adored the online elements anyway. There was a fantastic feeling of shared struggle whenever I caught a glimpse of another player's ghostly form. As a solo adventurer the limited interaction actually emphasised the sense of loneliness. Our worlds were linked and we were pursuing the same goals, but there was a wide gap between us. We couldn't communicate directly, but I learnt lessons from their spilled blood and found safe places, shortcuts, and hidden treasure thanks to their scrawled messages.
No community is perfect, and I couldn't completely trust other players. There certainly were misleading messages tempting me to fall to my death. But on balance Demon's Souls players were more helpful than harmful.