Paramount/DreamWorks' sci-fi action blockbuster Transformersobliterated the competition over the weekend, opening on an estimated$67.6m over three days that rose to $152.5m including previews overthe six-day July 4 holiday week.If estimates hold up this will be the biggest first week result for anon-sequel, overtaking Spider-Man's $151.6m mark set in May 2002.Michael ...