Watched Hypercube. Didn't like it that much. Thought the acting was pretty bad. None of the characters seemed that freaked out in the beginning. Also, the little cube expanding death machine thingy was pretty lame. I'm gonna go ahead and watch Cube Zero just to finish off the trilogy, but I'm not expecting much.
Edit - Ok. Just watched Cube Zero. I thought it was much better than Hypercube, but not as good as the first. The one dude with the false eye was pretty annoying though.