The Fantastic Four has proven to be an oddly tricky team of superheroes to adapt. After decades languishing in the custody of other studios, Marvel finally got their “First Family” back after a pricey union with 20th Century Fox. Six years after those nuptials, the first MCU-produced family takes its first steps onto the big screen this weekend. With a fresh visual palette and a quaint sense of optimism, it’s a reliably agreeable re-introduction to a quartet that’s slated to be a key piece of Marvel’s latest phase of storytelling, that falls somewhere between Fantastic Snore and Fantastic Fine on the excitement-meter.