Me too! I know it probably sounds like my comment belittles everyone with those titles, but I'm not. I guess what I am saying, in my experience, Good Product Managers are extremely, extremely rare, and ones that peddle bullshit are extremely common, and unfortunately, it's probably all but impossible to tell which is which during a hiring process, because they will all portray everything they've ever done as a massive success.
I often say that "doing the right thing wrong" is more important than "doing the wrong thing right". In other words: the choice of which problem to solve is more important than how you solve it.