Disappointment, “Ismael’s Ghosts” is not the near-perfect film that “My Golden Days,” which screened at Cannes last year, was. Desplechin’s new film, which launched this year's Cannes Film Festival this morning (Cannes is celebrating seventy this year) is sketchy and brutal and impertinent and camp. It has some grand, theatrical dialogue (and it works well), like its predecessor from last year, memorable lines, like, "I will rip your mask off and make a prince out of you.”