The movie is too long, and the complicated story is not really convincing

Rating: 5/10 (21 May 2020)

It is a great story for a novel, but for the movie, it is a bit complicated, which caused the movie to be so long. The cast did okay job. The flying car and ghost effects, costumes, production designs, and properties are well-done.
The visual effects for Dobby and basilisk among others need improvements. Hermione as the only student who knows everything is too much. Harry and friends do all the work, no senior students, teachers or staff did anything to help or could figure it out at all. The main characters are always so lucky and everything always happens at the right time and at the right moment for the sake of the plot.
Debatable holes:
1) When using the Floo powder, what would happen if there are two places with the same name? If there are multiple fireplaces at the destination, which one will be used?
2) Hagrid found Harry at Knockturn Alley at the exact moment he needed help.
3) How would someone know that there is someone at the other side of Platform Nine and Three-Quarters?
4) How could Ron have the car key?
5) How could Harry and Ron arrive at Hogwarts using the flying car? Is it connected to London King's Cross railway station?
6) How could Dobby put a spell at Platform Nine and Three-Quarters just in time? Was he around there at that time? How could he catch up?
7) When a teacher gives a house points, who writes it down? How does the teacher know about the student's house? Do they remember every student?
8) If a student could get point just by simply answering a question, then it should apply to all actions taken by the students.
9) How could Gilderoy Lockhart the new teacher know the students' name?
10) If the professor could easily lose his wand from Cornish Pixies, how could he become a teacher in the first place? Hogwarts as the best magical school should be questioned.
11) Why were all classes at Hogwarts so dangerous and destructive? Did they not have teaching methodology, system, and curriculum?
12) Why did all students except Harry, Hermione, Ron and Nevile, left the class when the Cornish Pixies were causing trouble?
13) When Harry and friends found Argus Filch's cat, why did Argus, and then the students, and then Dumbledore and other teachers come together just in time?
14) For this movie, only teachers relevant for the movie showed up, just like in the first movie. Except during dinner, of course.
15) It is unfair for heads of houses to be able to give or take points.
16) Audiences and players could die from playing Quidditch.
17) They should have stopped the Quidditch game when the ball was out of control. They did not do anything when it destroyed the stadium. They did not even do anything when it almost killed Harry.
18) Dobby almost killed Harry few times.
19) How could they blame Harry Potter just because he was at the crime scene? Hogwarts is an educational institution, not a drama club.
20) What is required to cast a spell, exactly? Does someone should think about the spell in its mind? Say it out loud? Sustain eye-contact with the object? Need a wand or just hand wave? How could magical object be sentient? How could magical spell be active all the time without eye-contact from the one who makes it? How is someone chosen to be able to perform magic?
21) What does being a member of a house actually mean? Does it teach or give something to its members? If a certain house is bad or good, why is the system still applied? No other houses have been highlighted so far except Gryffindor and Slytherin
22) How could Crabbe and Goyle be stupid enough to eat a flying cake? If it was flying, then of course it was spelled. They should have known it, except those 2 characters were more stupid than Dobby.
23) How did Harry and Ron know that Crabbe and Goyle, and only the two of them, would come out of the room, see and eat the cake without thinking with no witnesses? How did they hide the bodies?
24) Hermione did not lock the bathroom door when she was turning into a cat.
25) Hagrid suddenly found Harry and friends when they were talking about him.
26) Dumbledore and Fudge came just in time before Harry and Ron. They did not see them at all. What made the problem so important that the minister himself have to come to Hagrid's house without assistance?
27) When Harry and Ron came out from Hagrid's house, no one saw them.
28) Why did recovering the petrified students take so long?
29) If the problem could cause someone to die, or even cause Hogwarts to shut down, why did the teachers not form an investigation committee and do something? The senior students could have done something too.
30) How could Gilderoy Lockhart be a Defence Against the Dark Arts teacher? Was he not tested and selected?
31) How could Harry easily open the paths to the Chamber of Secrets? How did he know about what to say? Could someone with no ability to speak to snakes open the chamber?
32) Before Harry, Ron, and Lockhart entered the chamber, they should have called the teachers. No one even realized that they found the chamber.
33) The cave-in surprisingly separated Harry and Ron, with Harry on the side leading to the chamber.
34) How could a memory have a body and be tangible?
35) How could Tom manipulate Ginny?
36) If Tom was just a memory, how could he know about recent events?
37) How could Fawkes come just in time to save Harry? How did it know the location?
38) The basilisk should have easily caught or defeated Harry.
39) A piercing sword should have not easily killed the basilisk.
40) Could Tom perform a magic spell? He could write his name using the wand.
41) What proof did they have that Hagrid was sent to Azkaban?
42) Once again, Hogwarts, the best magical school could not even stop another Voldemort-level threat, but 3 young students could. In fact, the teachers were in their way and people were accusing them of terrible acts.
43) What was Tom's intention after realizing the basilisk?
44) Lucius should have been sent to Azkaban instead, because he was the real culprit. There were witnesses that he put the diary at Ginny's basket: Harry, Hermione, and the Weasleys.
45) How could the basilisk survive for so long? What did it eat? The chamber's exit was not only the entry way.
46) How did Dobby know that Harry was in danger?
47) What danger could possibly harm Harry, as mentioned by Dobby?