He didn't miss. It went right through the IBM insignia near the corner. I thought so too.
I think what he did wasn't necessarily the best way to handle it, but it was effective. He didn't intend it to be broadcast to the world, just his girl's FB crowd. The same folks that she ranted to about him and her "oh so difficult" life.
I don't agree with shooting the laptop, per se, but then I think most of you are too fixated on guns in the first place. But rendering it unusable, that was totally acceptable in my eyes.