Trolls feels like a feature length advert for dolls, and that’s just what it is. But like many adverts for toys, it’s often fun to watch, a gaudy, fuzzy, airy slice of noting but fun nonetheless. Justin Timberlake and Anna Kendrick are ideally cast as the star-crossed lovers of the troll community, and both give impressively personable vocal performances. Various hangers on, including Russell Brand and James Corden have comparatively little to contribute, but this Shrek-lite tale of warring kingdoms and dating princes is likely to become a family favorite by dint of its undemanding, pleasing quality. The prominence given to hit single Can’t Stop The Feeling in the climax doesn’t hurt, but all the music choices are generally in tune with the jolliness of the whole enterprise.