It's a measure of the times that the new version of "The Karate Kid" manages to be longer and bigger-budgeted than the original while having lesser impact. Featuring Jaden Smith in the title role and Jackie Chan as his unlikely mentor, the reboot certainly will appeal to younger audiences and nostalgic baby boomers who made the 1984 film (if not its several sequels) a smash hit. But there's no doubt that much of the original's charm has been lost.