Dionysus said:FO and Arcanum don't have enough hand holding and they don't have the same sandbox appeal as FO3 or Fable 2. Planescape has way too much reading. Something like BG2 could sell well, but it honestly isn't very different from some contemporary games, except that it packed in more content than you'll ever see from Bioware again.
I'm not sure a game being sandbox is a universal "appeal". Some games are better left railroaded and straightforward.
BTW, did I just see "too much reading"? Seriously, if the amount of text in a game would be crucial to marketability, and excessive reading would ruin games, then Japan must be imagining its big gaming market. Have you ever played an Asian RPG, much less a visual novel game? One of those game I played this year probably has more text than all of US releases of 2008
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