This is a movie about a project handle wrong from the starting line. At first I was intrigued by the idea of this movie. But upon the first few minutes I realized this is just a mess, they ruined their subject, NIM, right from the beginning. The woman Stephanie did nothing to try and raise the chimp in human fashion, outside of unconditional "love". She loved him, but she didn't guide him. This wasn't about accepting him as he was, the whole idea was to bring him up "human". She let him run free with no reinforcement to correct negative behavior to others. She seemed kindly enough, but so wrong for the intended purpose. By the time he was placed in the care of another more orderly individual, all characteristic traits had been ingrained in him. As with human kids their developmental stages end at 7, I am no expert but I imagine it is much earlier with chimps. The crucial time was missed and they thus messed up an animal, suspending him in a limbo of identity neither suiting him particular well.
The movie is more about a team of people trying to salvage and place an off the track train back on it, when the damage was already done.