Just watched this in 3D. Everything I was expecting from the reviews comments and trailers. This thing was an a/v rollercoaster thrill ride and I loved every minute of it! Strap in, turn off brain, enjoy experience.
No, it didn't have an in-depth storyline, and no, the acting won't win any awards, but I personally had no problems with the actors or their acting. In fact, I'd say the lead actor did a better job in this than the lead actor in Tron:Legacy (or Hayden whatsisname who played Anakin in Star Wars 2&3).
3D was pretty impressive all around for PR, and as for the soundtrack, although it was pretty loud and I heard a little clipping on occasion, it wasn't anywhere near as offensive as in STID.
As far as the bass goes, I kind of have mixed feelings about it. Extension in the ULF region would DEFINITELY have benefited the experience for those capable of it (this movie like so many others recently has a pretty steep filter below 25-30Hz). I also get the comments from some about the droning bass. Yes, it was a little one-dimensional for bassheads and bass critics, but on the other hand, I realized that the folks mixing this track were really targeting Joe Average in the theater, and not Joe Audiophile LFE connoisseur in the HT.
They obviously mixed this to impress the average viewer in theaters, and theaters typically can't reproduce bass below ~30Hz with appreciable authority. I personally thought the 'droning bass' added to the movie's atmosphere/experience, to convey impressions of the size and mass of the things onscreen through sound systems incapable of reproducing frequencies below 30Hz with significant SPLs and. Viewed in that light, I believe it succeeded based on the many comments from folks' experiences in commercial theaters.
As a fan of ULF and the added dimension of realism it imparts (as ULF is unfiltered in the real world), I would really have enjoyed extension down to single digit Hz. All that said though, I definitely enjoyed PR 3D and look forward to the sequel.