You know, in screenwriting we say that an ending should be "unexpected yet inevitable", but this may be the first time in almost a decade I can say I actually got the "unexpected" part. (No spoilers in the Comments.) Apocalypto is magnificent. It's visionary in the old-school sense of "one film-maker's consistent vision.". So simple, but simplicity exercised with ruthless emotional efficiency.
It's not a masterpiece but a masterwork. A must-see on the big screen, and the script's got some subtleties in it, a narrative simple, yet rich ... just go. It may not be the best movie of the year, but it's the greatest if that makes any sense.
The only odd thing is, if you stick around for the credits, the evil bloodthirsty Aztec priest is identified as "Rabbi Liebowitz" and the rapacious immoral Aztec Royal Family are "King and Queen Goldman." Minor points.