In July I wrote that Spider-Man: Homecoming was the funniest Marvel movie so far, a distinction that has lasted all of, oh, three months. Actually, Thor: Ragnorok is the funniest one yet. The Marvel factory, whatever its faults, is pumping out plain old good times on overtime hours. Ragnorok, the third and presumably final solo outing for Chris Hemsworth’s Men’s Health Goldilocks, retains some of the studio’s familiar issues, but makes up for them by being — for long stretches — honest to goodness hilarious. The Lord — sorry, God — of thunder is front of house, but Kiwi film-maker Taiki Waititi is the man of the hour,…