A lot of reviewers are saying the 3D is "terrible". I disagree. The purpose of the 3D is to add depth to the story, and place you inside the "grid" with the characters. It succeeds on this level, and I can only assume that the naysayers are looking for things flying out of the screen at them.
The movie itself is extremely enjoyable despite some subpar acting by Hedlund and plot issues. But is that really why you're watching a movie like this? The film on a whole is great, and the music by Daft Punk is the cherry on top. Enjoy.
What's great about it: Action, Depth, Enjoyable movie