I will try to answer some of the questions presented by BeefCurtains.
The California programs are terrific, but they probably do not get the same amount of respect that their east coast brethren receive. For one thing, the reputation of their undergraduate schools and medical schools (with the exception of Stanford) are arguably lower on the academic scale compared to the Ivy League schools. The following comments are my own impression from interviews and rotations from last year.
I'm not sure where the rumor started that UC Davis is the best. I think it is an excellent program, but is considered to be "sliding" by some. Sacramento is also not a fun town. UCSF is a program with a great reputation, but it is a tough grind. The attendings are malignant. I understand that many UCSF medical students choose NOT to stay at UCSF orthopaedics if possible. UCLA residents operate a lot at their outside hospitals, but not that much at UCLA proper. Lifestyle is excellent at UCLA and is apparently a good mix of operative time, clinic time, and free time. Also, this program does an outstanding job matching its residents with fellowships. USC is trauma heavy. It will be interesting to see how this program changes to comply with the 80-hour workweek rules. Nonetheless, USC residents definitely know how to operate when they finish and can be considered "trauma-fellowship trained" by the time they finish (if you like that kind of thing). UCSD is a solid program, but it is six years long (at least the last time I looked). San Diego is a nice town.
It would be hard to rank these programs, but I would probably rank them:
1. UCLA
2. UCSD
3. UCSF
4. Stanford
5. UC Davis
6. UCI
7. USC
This is taking into account lifestyle, operative experience, and academic reputation. Feel free to comment.