I thought "Halo Killer" was only used by XBox fanboys at this point. Ack, I hate to be proven wrong again on this. This is BEYOND inane here.
The only think you need to know here is to which is on top:
Halo 3 has Griffball. Killzone 2 does not. Halo 3 expansion will feature its own Grifball court as part of the add on.
And yes, I can say this jokingly, but if you look into what is involved with how Griffball came about, it shows a LOT as to why Killzone 2 is NOT a Halo killer.







