I saw it in IMAX and thought the dialogue was just poorly delivered half the time and usually in some accent that make the technobabble difficult to follow. Calling the lead "protagonist", him referring to himself like that as well, was incredibly distracting and hard to take seriously.
The inversion stuff was fun to watch visually but was handled poorly from a continuity perspective IMHO. I get they needed masks so the viewer can tell the streams apart but the explanation makes no sense, especially since they presumably need to eat and drink as well. Still, it was fun and a nice James Bondy type film with a hint of sci-fi.