Will Smith’s powers are even more extraordinary than those of a caped crusader who can leap way beyond the tallest buildings in a single bound. Smith has salvaged many vehicles more threadbare than “Hancock,” and though his latest venture is decidedly uneven, he seems poised to score yet another supervictory at the boxoffice. The movie is a good showcase for him — and for co-stars Charlize Theron and Jason Bateman. Imagine the heights they all …





