Having missed the first "Night at the Museum" movie — willfully, I'm afraid — I was surprised by how funny and well-made the sequel is, especially for a "family film." "Battle of the Smithsonian" is packed with set-piece scenes of a sometimes uproarious nature and intricately constructed digital action sequences. (In fact, truth be told, the movie has a little too much going on.) And the star, Ben Stiller, who doesn't always rub everybody the right way, is shrewdly positioned here: Apart from a few snappy spotlight moments (a mad verbal wrangle with Jonah Hill as a dim museum guard, and a Three Stooges-style slap-down with a couple of monkeys), Stiller generally — and generously — functions as a traffic cop amid a swarm of sharp comics, including Amy Adams at her most adorable and the great Hank Azaria at the top of his game.