It's hard for me to imagine that I would have ever found half the movies I really love, or had the boundaries broadened regarding what I think a 'good' movie is capable of, if I bailed on every movie that I felt bored or alienated by half way through. A lot of great work keeps its meanings opaque, or hides its emotional resonance, until the final act. Sometimes it won't be until you've seen the entire film that you can get an idea of what the intent of the director is.
But to each their own. I personally always think of my 'taste' as in a constant state of development, and that it needs the duress of boring or frustrating or baffling moments to bulk up.
But to each their own. I personally always think of my 'taste' as in a constant state of development, and that it needs the duress of boring or frustrating or baffling moments to bulk up.