You don't always need a killer ap, obv if you like japanese games you own a ps4 over a xbox and if you like racing games you own a xbox over a ps4
But yes a killer app is a game that sells a console, a game that convinces you to pick it up, uncharted 4 deff has this and bloodborne did 2, apart from that its been scarse, but not just on the ps4 side. Its been slow from first parties, but this year looks promising!

Twitter @CyberMalistix







