This movie's reviews, more than any I've seen in quite a while, are all over the place, which is quite unusual for some of these teen angst movies because they are usually loved my one group, or age, and panned by another.
As someone in their late 50's, who was an Air Force "brat" that seemed to move every two years or so, and whose father "retired" from the service when I was in my teens, I found this to be a credible movie. In my instance, we moved to rural Alabama after having lived in Germany, South Carolina, Taiwan, and Michigan. In addition to the "foreign" accent that I had that was slightly northern, I, also, was one of those short, smart aleck PIA's.
In Charlie's case, after being kicked-out of every private school there is, he is faced with the inevitable situation of having to attend public school, where he has confrontations with the school bully, played exceptionally well by Tyler Hilton, tries to get serious with an attractive girl student, who he doesn't realize is the principal's daughter, and butts heads with the principal, played in an understated way by Robert Downey Jr. Toss-in a mother who is half-flaky, a situation with his father we never quite understand (Hey what's a little tax evasion among the rich) and you have Charlie's situation.
Along the way, Charlie, played by Anton Yelchin, finds, through "chemistry," a way to interrelate to the other students by becoming a pseudo drug-dealer/counselor, with the counselor concept becoming a way that he fulfills himself.
In Charlie's case, he is successful, and to this end, he constantly strives to help others as a means of finding something worthwhile about himself.
I thought "Charlie Bartlett" was a good movie, much better than most people seem to be giving it credit, but I can understand where they are coming from with regards to their criticism, for it doesn't seem this could happen, but trust me, this could, and probably does more than the teachers realize.
I only give this movie four stars because of two scenes, both come at the piano, where, first, Charlie and his mom, pleyed by Hope Davis, sing "Those were he Days," ala "All in the Family;" and the second when Charlie and the principal's daughter, Kat Dennings, play and sing at the piano. Both lacked any lead-in to the scene, and could have been left-out without much impact on the movie, although Kat's scene did show a dice of her you didn't always see otherwise.
Overall the movie showed that sometimes we choose life's roles, and sometimes those roles are chosen for us, but whatever is the case, we all have roles...at the very least they are to set a bad example, and at the most, they are to inspire.
By the end of the movie we see how Charlie, his mother, his girlfriend, and his principal all inspire....