I'll keep this short. I lost my save file, the mechanics were clunky, audio and visual didn't sync up, the AI was as dumb as they come, the story used every cliche in the book, and ended with a level becoming so broken that I couldn't continue on. Literally. An airlock that was supposed to open remained closed. I was so infuriated.
The only pro for this game is it looked wonderful. Graphics are the only reason it's not a 1.
I have enjoyed the other Killzone games. This was uninspired. This whole next gen system experience should have included great launch titles and this was supposed to be one of the Flag Ships. It was lack luster, guns were meh. Enemies were nothing but random trash mobs you identified by looking for red eyes in a sea of dark mobs against a dark background. One component I could not forgive was Spawn Pops. If you happened to die, half the time you resurrected in the middle of an area with trash mobs knocking you down to half life before you had the ability to even move your character.