Sometimes crappy films are interesting. Their failures flag up ludicrous studio decision-making, or a creative ego gone unchecked, or just a series of small misguided steps that, in retrospect, were so obviously the wrong path to go down. For those of us professionally curious about why stories do or do not work, these movies are instructive and shareable; the critics’ version of “Hey, smell this!”. But, really, most of the time, bad or boring movies are bad or boring in ways that are totally predictable. Watching them is an exercise in low expectations met. Alita: Battle Angel, Robert Rodriguez’s big-screen…