Console crowd anyone? It's of no surprise that console players were bowled over by a game like Bioshock coz they have never played a game like that before. Furthermore, it is so easy that even a grandpa/grandma can play it, as what Ken Levine had mentioned previously.
And lets not forget the hype surrounding Bioshock. Lots and lots of hype and even going as far as claiming that it will 'revolutionise' the FPS genre. A lot of people fell for it even though it turned out to be nothing more than an average FPS with RPG elements thrown in. Don't need to be a rocket scientist to figure out that this game relies heavily on hype for it to sell.
