I don't have Demon's Souls plat, but that game was way over sold on how hard it is.
If you take your time and don't try to bum rush opponents, its not tough solo.
and the fact you can summon 2 friendly souls to help you, and they usually know the exact way and everything to do, makes it really manageable.
I felt a lil ripped off, and should have gone solo my first time, cuz i kept summoning blue spirits and they would know exactly which way to go and how to beat the boss and it took away that magic. but yeah, can't blame anyone but myself. kinda like borderlands with high leveled co op friends just defeats the whole purpose of the game, lol.
and a playthrough isnt really that long, i was always hoping they would 'fix' that broken monument or whatever its called and that would be a new dlc level, but nope.
now when they shut down the servers that they warned they would do every few months, then it will be alot harder.
no more black phantoms, but cmon, those guys are fun
ooh and i miss squid face prison guards and their bell chiming... so creepy!