Killzone 2's gameplay, attention to detail and environments look awesome. Hopefully the story is well thought out and well executed.
Highly anticipated for me! 
1) Gameplay
2) Game environments and level design
3) Graphics
4) Story
5) Audio
In that order for me regarding most types of games, but all those assets need to be at least 'good' to create a top game experience overall.
IMO it's sad so many fanboys pre-emptively want to diss this game just because of the issues Killzone 1 had. The PS3 is far more powerful than the PS2 and there's a far bigger team working on polishing up and tweaking this game. Killzone 2 seems very promising to me and most people who had their hands to the pre-alpha.







