I just saw it as well and was really impressed. Granted I haven't seen several of the others nominees yet, but this one, especially for anybody who's lived in LA is really something.
It's the best LA can or ever will look, absolutely gorgeous.
I've always been indifferent on Joaquin Phoenix but he did a great job here. As did Scarlett Johansson. Olivia Wilde was the only slightly off note for me, didn't quite fit but not a big part.
But the ideas behind it also really did something for me. Every other time I've heard/read anything to do with 'The Singularity' my eyes glaze over. But this, for the first time, I could really see. And the slightest hints at what was going on as the OSes develop was pretty deep Sci-Fi without spelling it out and losing half the audience was very well done, I felt.
I highly recommend Her.