Gears 2 sold well because it had a fanbase of over 5M, plus both titles released during the holiday season and in Gears 1's case it was the first BIG game for the 360.
Halo 3 sold well because it had a fanbase of over 7M, plus it released during the holidays and the first game was the first BIG game for the XBox.
Killzone sold 1M in the first 2 weeks despite being a sequel to a mediocre game that had a fanbase of 2M, plus it released in February, not the holidays like the games it constantly gets compared to, the original wasn't the first BIG PS2 title, it released late in the PS2 life cycle so it didn't get the same kind of sales bump that Halo and Gears had.
iPhone = Great gaming device. Don't agree? Who cares, because you're wrong.
Currently playing:
Final Fantasy VI (iOS), Final Fantasy: Record Keeper (iOS) & Dragon Quest V (iOS)
