I don't know whether to praise the film makers for injecting some new ideas into the Cube universe, or to slap them for even attempting to make a sequel to a film which simply didn't need one.
I'm leaning towards the later.
On the plus side, the performances are better and the rules of the new Hypercube make the familiar narrative (of a bunch of people stuck in a bunch of cubes) seem fresher than it probably is. But the attempt, this time around, to explain who and/or what is outside the cube feels all wrong. I have to admit that I wasn't particularly enamoured with the ambiguity of the original's ending, but the ending to Cube 2 is even less satisfying.