By the time I got done watching “She Devil” (1989), I realized I hadn’t really watched it at all. Not like “just watching a movie,” anyway. I’d examined it, as I might examine a client’s tax information, or a sheet of football statistics, trying to solve a puzzle or discern a trend. Trying to learn something. What did I learn from this lowest-common-denominator comedy in which a scorned, frumpy housewife seeks revenge (spoiler alert: hijinks ensue)? Roseanne Barr is unlikeable at a molecular level, Meryl Streep tries too hard – at everything – and a bad movie isn’t worth “just watching” sometimes.