He wasn't, but he presented the award and that's the point.
Everyone else nominated, and the presenter of the award, are better filmmakers than Iñárritu.
JJ isn't perfect, but there's at least something underneath if his work, even if it is flawed. I don't like SUPER 8 and dislike STAR TREK INTO DARKNESS.
But I think JJ is more genuine in his filmmaking than Iñárritu, who has nothing interesting or meaningful to say. He's pretentious and is all style with no substance. When you peel back the superficial layer, there's nothing beneath his work.
JJ may cater to fanboys, but Iñárritu caters to pretentious film snobs.
Amores perros is better than any film Abrams has made or will make.