MiB 3 is indeed amazing and the guy they got to play K when he's younger did a fantastic job XD Will Smith seems flat though, which is even stranger when you read he demanded to come BACK and re-shoot scenes because "he didn't like the way he acted"...the replacments wern't all that better.
You shouldn't have even tried it XD This same shit happened a few years ago when hollywood wanted to make the "AKIRA" movie, where everyone takes part in a bike race to pick up relics called "AKIRA STATUES" to fight and win the heart of their woman and be crowed KING OF AKIRA...thankfully people saw sense and canceled it :/