I thought this was just okay. I have two takeaways:
1) What Treadwell was doing was not really helpful. Historically, bears and humans have a balanced relationship where they just stay away from each other. Treadwell was threatening that balance by getting too close to the bears and "teaching" the bears that it is okay to get close to humans.
2) The bears (unlike gorillas or monkeys) don't really bond with humans. While Treadwell thought he was befriending the bears, they looked completely indifferent. They were just contemplating whether they should eat him or not.

Quoted: A devastating and heartrending take on grizzly bear activists Timothy Treadwell and Amie Huguenard, who were killed in October of 2003 while living among grizzlies in Alaska.