watched it in digital IMAX...audio was very immersive so you felt like you were actually in the ship but I did have trouble hearing some dialogue.
non-IMAX scenes were indeed pretty bad...mostly on Earth so you don't miss out on too much details.
i'd rate the movie 7/10...i may appreciate it more on subsequent viewings esp the last 45 minutes. I applaud Nolan for trying to take tackle themes of this scale...but I don't think he'll ever top Memento for coherence and artistic style. I've noticed The Dark Knight Rises and this one the last 45 min feels too rushed and suffers feature creep as he tries to cram too much shit in for that epiphany factor.