i wasn't here when halo 3 was yet to be released, but i can believe that killzone 2 has more hype.
there's a lot more expectation for what killzone 2 will do for the ps3 and halo was already an established franchise whereas the first killzone wasn't received very well.
lots of people looking forward to a game (halo 3) doesn't equal the expectation generated by the hype of what the game will do (killzone 2).







