Yeah, I saw it last night and thought it was fantastic. I'm not generally into that kind of story/setting, and I hadn't seen a preview - I actually didn't even know it was in 3D. My buddy kept telling me that it was, but I assumed he meant rendered out using 3D visualization.
I found the first interior scene with all the pods/chambers was hell on the eyes and I wondered if I could adjust to watching it, but the rest was effortless. The effects were completely believable and just really well done. The 3D was done so subtly in many scenes that you didn't really even think about the depth, and then bam in some scenes - it really stood out.
I have to say, I was really, really impressed.
EDIT - I meant to mention that the part that impressed me most was: gunfire, 3D, enough said.. Amazing