What's the point of this film and why do people like it so much?

Rating: 4/10 (2 January 2017)

The good: The outstanding performances of Miles Teller as Andrew and J.K Simmons as Fletcher. They both were incredible in their parts and it seemed as if they gave their best in portraying the two male leading roles. The film surely wouldn't be the same if it wasn't for these two to lift it off. I also liked the fact that this film pays tribute to jazz music which is so overlooked in this age and time.
The bad: Pretty much everything else. It seems like the initial goal of this film is for us to sympathize with the protagonist and share his ambition. We are supposed to like him, admire him for his persistence and cheer for him as he is trying hard to succeed in what he wants the most. But soon, we discover that Andrew's character is a self- centered, self-righteous, arrogant guy who thinks he is the best musician that has ever existed just because it is his ambition to become one. He hurts everyone else's feelings and diminishes them because he seems to believe he is more talented than them (as if it's him who decides that). For example, when he tells the girl he was supposed to be dating, that he does not want to date her anymore because she will slow him down, she asks him if that is because she said she doesn't know what she wants and he is positive. Which means that in his mind, just because he has found a thing he is passionate about, he is superior to the girl, who hasn't found a hobby or career path. Before that, when he is at the dinner table, he seems agitated because his family is not always talking about him and his drumming thing. He tries to change the subject back to his drumming and proceeds to diminish their talent because he really does think they will never amount to him. Which means that although he doesn't like the emotional abuse he is receiving from his teacher, he likes mentally abusing other people.
Furthermore, I do not clearly understand what this film is trying to prove or make us believe. That it is okay to be emotionally scarred for life if some teacher says it's for your sake? Are we supposed to be relieved when the teacher reveals he is being cruel only to motivate the students to be the best and say ''Okay, he wasn't that bad of a person'' because I don't think that's a sane thing to do. The way to motivation should not (and is illegal to) include battering the students, calling them names, using their family background to verbally abuse them and insulting them in numerous ways. So, even if the teacher thought that was the way to make them better, it does not make him a better person. It makes him a monster.
What's even worse is that Andrew seems to like his teacher in a weird way. He knows he is a good teacher and an even better musician so he is trying to look up to him and be the next Charlie Parker. Which means, he has to be as mean and as selfish as his teacher already is so that the teacher finally gives him his blessing. Is that what we want our kids and fellow men to do? Can't someone be the greatest musician ever without being an arrogant guy that puts other people down and admires the wrong kind of people? Couldn't Andrew just be humble and a nice person with the same persistence and drive?
Another thing that really angered me off is how Andrew is indecisive. He swings from wanting to kill his teacher to cooperating with him to get him to like him. He confesses that his teacher is verbally abusing everyone in his class, he knows that the teacher's ways have led to someone's suicide so it looks as if he understands how bad of a person Fletcher actually is. Then he talks to Fletcher, plays with him at the festival as if there is nothing wrong whilst still admiring him as a teacher and musician. And after he finds out his former teacher has betrayed him by ordering a new song he didn't know, he leaves enraged, only to return to his drum set and give everything he's got....Is he suffering from bipolar personality disorder or is he just not sure of what he wants in life?
Overall, I did not like much in this film. Sure the performances of Teller and Simmons were something else and the cinematography is brilliant but in the end, this film should not be anyone's favorite.