The word “objectively” in film criticism is baffling. People do realize story and character tropes that we call “good writing” are designed strictly to evoke emotional reactions out of people? “Good” depends on whether it evoked the intended emotion (or should I say, what the audience feels like is the intended emotion). And emotional reactions are subjective. The very nature of judging film is subjective.
Also, different filmmaking aspects are weighed differently by different people. It’s up to the individual person the ratio for which cinematography, character development, music, pacing, plotting, etc. hold value in their critique. One person could value character development as 50% of their entire critique, or 20%. And so on.
The only way you can use “objectively” in film criticism is if you’re describing what straight up does and doesn’t happen. Like, someone would be objectively wrong to say Darth Vader never sits down in the OT.