Yes, buggy, wasn't it. A very good game, nonetheless.
Though In Memoriam had many many flaws, it deserved more credit than it got for an interesting idea and very creepy use of emails from a kidnapper. Brief, but addictive.
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It wasn't underrated, just completely ignored because of the horrible performance issues. Considering how the story falls apart later in the game and how some of the concepts make little to no sense... This game sorta deserved it's fate.