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★ ½ Alex Cross Poor Tyler Perry takes over for Morgan Freeman as the forensic psychologist and detective of James Patterson’s crime novels. When he’s not Madea, he’s a dud. But the film is bad on its own. Some movies make it to theaters, and you don’t know why. Nothing works. Or some of it works, but that doesn’t matter because what’s working is so deeply, painfully boring. This is that kind of movie. (102 min., PG-13) (Wesley Morris)