If you are a PS4 owner have yet to try the game, then you may be interested to know that Sony is making the multiplayer portion of PlayStation 4 launch title free for a week.
From 4th - 11th March you'll be able to download the shooter and you won't even need PS Plus to try it out. Of course if you love it that much that you want to continue then you'll need to fork out for the privilege. Still it's nice of Sony to let you try anyway.
Killzone Shadow Fall is a decent enough shooter and compliments Call of Duty and Battlefield 4, which are also currently popular amongst players on Sony's system.