In the ’70s, Robert De Niro and Christopher Walken starred in the seminal Vietnam War film The Deer Hunter. It ranks among the more harrowing entries in an already brutal genre, unflinchingly depicting the conditions of abject inhumanity in the war zone and then bringing the trauma home to spiritually gut a declining Pennsylvania industry town. A lot has taken place since then, however. We’re now living in a post-Dirty Grandpa world. The news of another collaboration between De Niro and Walken no longer heralds an intense drama with awards potential in its very DNA. They’re now the twin titans of Grandpa Cinema, and their latest project has to reflect that.