killzone 1 in my opinion was terrible. The sounds of the soldiers yelling stuff was just terrible and the graphics were shaky. I doubt killzone 2 is going to be much better. The trailers look good for it, but it really doesnt offer any depth. You are basically doing the same thing you were doing in 1.
Halo is an empire now for microsoft. Halo is like sonic for sega, or mario for nintendo (well, maybe about half of what mario is to nintendo).
Ive heard that xbox360 sales are through the roof because halo is coming out in a few weeks.