Plain and simple, I loved Upgrade. The acting was great, as was the directing and pacing. Also, Whannell wrote a darn good story, somewhat reminiscent of one of my all time favorite movies —Robo Cop.
I had zero expectations when I walked into the theater, and left pleasantly surprised.
One caveat: it is pretty gory, but not much more than you see on any CSI show. (For those who remember Robo Cop, Upgrade has the same kind of gore, just much more, and administered more creatively.)
Movie Grade: A-