SPOILER-FREE -- Had my doubts about the runtime on this one and, sure enough, the first hour was largely unnecessary and, dare I say, boring in spots ... but then comes the water and OMG, the WATER! The water scenes were incredible, particularly the underwater stuff. James Cameron might be the best director ever with underwater filming, and he's still got the chops with action scenes.
The last third of the movie, no spoilers, was one long action scene that…