Nothing against Matthew Perry, I believe he acted just fine in the movie. However, when movies are "based" on true stories, they are usually stretched as this has to be the most embellished of them all! It wasn't the acting that bothered me, the youngsters actually did very well in that respect.
When Ron Clark(Matthew Perry) first comes into the classroom and states there are 3 rules which he demands to be followed, thats fine. its when the movie continues & through out, Mr. Clark had as many as 25-30 rules all over the room. Thats the first No No! When your teacher, you establish your rules 1st and foremost to the students get accustomed to following them. "Procedure, procedure, procedure" once you start adding things or CHANGING things, the children(whether they are from the ghetto, or not) will become insanely confused and unfamiliar with the environment of the classroom.
When the class is on their way to lunch and the main character student cuts in line, Mr. Clark proceeds to ask her if she cut in line and then replies with "Until you tell the truth, the whole class will suffer" Lol, this may have been allowed or perhaps encourages in the older days of teaching, but I can tell you if a teacher did that now and a Principal saw it, you would get a warning or be out the door. It promotes negativity amongst the students and its not helping an already negative situation. There are other ways to go about dealing with 1 student while NOT affecting the rest of the class.
When Mr. Clark informs the students they are going to "Phantom of the Opera" all of the students get excited, especially Te-Shaun(however you spell it). That was where I laughed, I have been into rough area schools etc etc, these kids wouldn't know or give a rats ass about "Phantom of the Opera" this part was almost to the point where I turned the film off completely.
My last issue with the movie is this. Who is the token drunk white guy who beats up TeShaun lol, where did that come from in the movie? Don't get me wrong here, nothing wrong with the acting in the movie, but very unrealistic and if you think you can get kids in these types of areas to appreciate "Phantom of the Opera" and things like that, keep on dreaming. I'm not saying you cannot touch 1 or even 2 students and help them succeed, but this was ridiculous