Erm, I disagree. UOP has great clinical instruction. Their operative dentistry class is way beyond ours (even though they started a quarter early, they're still farther than us if we were in our next quarter). They have a huge patient pool (SF), and everyone is a pretty tightly-knift family, especially if you went to UOP undergrad (which I did).
UCLA is in a very affluent neighborhood, shall I say, and thus, our patient waiting rooms are pretty much empty and the floors are spotless since no one ever walks on them. Our research, however, would rank higher than UOP's, but it's still pretty competitive to get into a decent research program here if you're not a Masters/PhD student.
USC's program is quite expensive, but I think of it as paying for free relaxation time. They still do alright on their boards, and most pass the CA license exam. Since USC is located closer to less well-off areas of the city, they have a larger patient pool than UCLA.
What else...I don't know, I'll update this post as I think of stuff, but for now, its back to History & Ethics and Oral Radiology for my midterms tomorrow.