In all honesty films are completely 100% subjective. But most people enjoy good dialogue, a captivating story, and overall an enjoyable experience.
I have heard from somebody that apparently things such as plot holes and lack of character development can be considered objectively bad. However far from all complains towards the PT have anything to do with that(especialy if you don’t consider continuity between films to really be something that should be taken into consideration since movies should be able to stand on their own).