LOS ANGELES, United States ---Lionsgate's neo-noir action thriller "John Wick: Chapter 4" opened this weekend with North American ticket sales estimated at an impressive $73.5 million, industry watcher Exhibitor Relations reported Sunday. Analyst David A. Gross called it "a superb opening," noting that each Wick sequel has managed to outdo its predecessors. Reviews have been mostly positive: "Would that all action films were so well and cleanly choreographed," the Washington Post gushed; but some reviewers saw the body count -- more than 100 per bloody Wick movie -- as a bit much. "Chapter 4" owes its choreography largely to director Chad Stahelski, himself a former stunt ma...Keep on reading: Latest ‘John Wick’ tops North America box office in a big, bloody opening