Seriously these reviews are starting to confuse the crap out of me.
I have been reading various reviews looking mainly for the length required to finish the game.
Some reviews state 4-5 hours to beat, others state 10-12.
Also I noticed this on one of the sites "Longer campaign that usual" and then "Single Player is beatable in a few hours" on another.
Did people play on easy and rush while the others played on hardcore? That's all I can think of. Lol.
EDIT: Examiner for example played on easy. No wonder people think it's short. Your essentially running and gunning. That's not a war, that's call of duty.
From Examiner who played it on easy:
"Most experienced shooter fans will be able to power their way through Killzone 3 in 10 to 12 hours with the default setting."