Agree with Harrier Dude about the MC "try out". I had one kid go through Navy OCS and one go through PLC at about the same time, about a year ago. Daughter, Navy, thought there was alot of mind-screwing games, losts of harrassment. She was shocked, however, at the poor physical preparation most of the candidates had, esp the females. In her class, only she and a male SEAL wannabe maxed the PT test, and she has never thought of herself as a jock. She was embarrassed by the lack of preparation and effort by most of the females. Several roll-backs from day one.
All in all, Navy OCS seems to be trying to make you into an officer, like it or not.
My son didn't think there were that many "games" at PLC, jr or sr. He is a really good athlete, and he found himself in the middle on the pack. Constant stress. Never failed an evolution, but never the top, either. He felt PLC was very intense, very challenging, esp srs. He felt that everyone who made it through the first few days was very well prepared physically, and from then on they just wanted to give you every opportunity to quit. Like Harrier Dude said, more of an initiation. They seem to use TBS to teach the survivors how to be officers.
All in all, USMC OCS is much more physical, and much more stress is put on leadership.
I went through AOCS years ago, and yes, Navy OCS has changed.