In the ten years I've been coming to the Sundance Film Festival, Dee Rees' adaptation of Joan Didion's novel The Last Thing He Wanted is easily one of the biggest disappointments I've encountered. I enjoyed Rees' breakthrough film Pariah and adored her 2017 movie Mudbound, but The Last Thing He Wanted feels like the work of a completely different filmmaker—one who has no idea what she's doing. A picture that's intended as a cross between a journalism thriller and a family drama ends up as an impenetrable slog of nonsensical plot points and thin …