In my opinion, PBL only works if you're surrounded by more intelligent people who will push you to your academic potential. All the PBL schools like to brag that "they've adopted the same teaching method done at Harvard." The difference? Harvard doesn't accept stupid people (for the most part) They take 35 geniuses, or people with the potential to become geniuses. They're not taking Billy Bob or Shaniqua, simply because they're the first generation college grad in their family, they're the right skin color, or accepted off the bottom of the waitlist because they were the only one who could afford it.
Sorry, but I, personally, am not going to be pushed by the average student with average DATs and average GPAs; vice-versa, I don't want to be the one holding some genius back because I don't entirely understand the complexities of orognathic surgeries (yet). I'm paying you hundreds of thousands of dollars to teach me, not to hook me up with an (often) less-intelligent classmate who doesn't have the full answers to my questions.
PBL is essentially equivalent to learning dentistry from wikipedia, but more prone to errors. I can google my questions and get better answers from it than some other student who only studied for 6 hours last night because , for some reason, he felt the need to spend time with his kids/wife (or go to the bar). No thanks, not for me.
After seeing how poorly it was done at Indiana (spoke to 3 students/friends there who said it's frustrating and not effective), I've cancelled my interviews at Case and USC. So there's the silver lining - someone else can enjoy the wonders of PROBLEM-based teaching.
Oh, also, for all you gunners out there - have fun helping out the competition! I don't want to make it even harder for myself to specialize, if I'm teaching my competition tricks of the trade.