Out of all the reboots, remakes, and sequels to land in multiplexes this summer, Terminator Genisys was the one that squandered the limitless opportunities offered by its franchise. The sentient computer network known as Skynet, a fleet of killer cyborgs, and a time travel device wrapped inside an apocalyptic tale were all raw materials ripe with possibility. After Rise of the Machines and Salvation, it couldn’t get much worse, right?