The movie had nothing to do with the Academy.
There is about a 30% attrition rate. Yes it is highest of the academies. A theory is that at the CGA you can't "hide" like you can at the other academies.
Remember though it's not about everybody else it's about you. If you have the determination to make it you will.
As noted the graduates tend to stay in the service longer than the other academies. The re-up rate is in the range of 80-85%.
Also don't believe everything you read in the "Princeton Review"