This movie was an experience unlike other. In earlier movies I've seen, you have this heady feeling after a movie, but not this one.
The whole movie is so engrossing, that you never realize that the 2.5 hrs are long, that too w.o a break.
James Cameron has taken movie watching and movie taking both a couple of eons ahead .
All in all, a great narration, better than life like graphics, and a whole some conceptualization, that will take another Decade to beat, and it will be James who will do it, just like he did in T2, and Titanic.
If you miss it, you're missing something great !!!