Halo has such a huge dedicated fan base that no matter if Halo 3 is a significant improvement over Halo 2 or only a slightly enhanced version, it's almost guaranteed to sell over 5 million copies in its first year alone.
Besides, just in numbers alone, there are about 6 million more 360's then there are PS3's so unless you are talking about a per console average, I don't think you can even use sales to accurately compare the popularity between different games on different platforms.
I suspect KZ2 will sell well, but then again, if they really do push the envelope on realistic gore, I would think that would hurt sales, not help it... but then again, that probably reflects more on my personal distaste for blood fest FPS games.
Bioshock FTW!
:tup: