I mean, there's the obvious, and overused "price" argument, but why does it seem so many companies are moving away from PC? This can be either alright, or terrible. In the case of Morrowind->Oblivion, this was a horrible, horrible thing, and I feel Fallout 3 was hurt by it as well, but not anywhere near as badly, as it was much more like "Morrowind with Guns." Complete with Cliff Ra-err, Bloatflies.
