Is the third time the charm for “Thor?” The latest installment in the Marvel Universe to have the God of Thunder front and center is indeed the best of the three. A goofy, tongue-in-cheek action adventure that relies a lot on quirky comedy, “Thor: Ragnarok” is an eye-popping extravaganza that should please most fans, even though it’s a notch below many other Marvel entries. Chris Hemsworth returns as the Asgardian price who finds himself exiled on the other side of the universe without his hammer. Meanwhile, his evil sister Hela, played with wicked relish by Cate Blanchett, is intent on destroying Asgard. While it’s predictable and offers nothing new, “Thor: Ragnarok” has all of the elements in place for a lightening strike at the box office. So, how do you follow up the raunchy 2016 comedy hit "Bad Moms?" With "A Bad Mom's Christmas" of course. Mila Kunis, Kristen Bell and Kathryn Hahn reunite for another look at contemporary parental challenges, this time with meddling grandmothers to contend with. The stars are fine, but they deserve better material than the simple, foul-mouthed script provided by the writing/directing team behind “The Hangover.” The cast seems to be having…