Some thoughts on the merits of Demon's Souls.
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Sources:
https://web.archive.org/web/20170402033346/https://www.theguardian.com/technology/2015/mar/31/bloodborne-dark-souls-creator-hidetaka-miyazaki-interview
Demon’s Souls was considered a failure internally.
https://web.archive.org/web/20170114122457/http://www.gameinformer.com/games/demons_souls/b/ps3/archive/2009/11/05/feature-demon-s-souls-director-discusses-difficulty-sequels-and-more.aspx
Bosses were designed to be different.
https://web.archive.org/web/20160601161850/www.ign.com/articles/2011/11/08/the-mind-behind-dark-souls?page=2
Player feedback helps drive the series.