I loved the demo. I haven't played yet (was broke when it released ... still broke now), but friends swear by it. Anyway, my take? Three things:
1) October 2010 was crowded with decent-to-great releases. NBA 2K11, Medal of Honor, Vanquish, Castlevania: Lords of Shadow, Fallout: New Vegas and Fable III all come to mind but I'm probably missing some. Those games went on to varying success (2K11, MoH, FNV & F3 great; Enslaved, Vanquish & CLoS not).
2) Reviews pegged it as a relatively short game with no replay value or multiplayer element. That's code for a ton of gamers to either rent or wait until it drops to $20-30.
3) Marketing. Wasn't much, but I'm sure that also kept project costs down.










