Maybe this hypothetical personal was so distracted by the amazing acting that they didn’t realize the plot was nonsensical, or vice versa.
Even so, if that amazing element caused the person to really like the movie, they shouldn’t begin to hate it because of a less good aspect they didn’t notice. No film is perfect, there’s always going to be something that could have been done better. But what’s ultimately the most important is your experience with the film and how you felt about it. Just because a film has issues doesn’t mean you have to dislike it.