Essentially, evolutionary improvements do not have the impact of revolutionary improvements and there is nothing revolutionary about Killzone 2.
==> I think it is a question of taste,
I like Killzone2 artistic style,
whatever, there is no FPS coming to Xbox360 that can counter Killzone2 in feb 2008 and since PRO FPS player (that have played to Fear/HL2 and are waiting for Crysis) are not console player, I think the average console gamer will still see Killzone as a beautifull game (>> Halo3)
Except to see Killzone 2 video in all the shop in Feb 2008.
Time to Work !