I don't know how dependent American med schools are on PBL, but from this thread (and others before it) it seems that everyone hates it.
But I think that PBL can be an effective way to learn if you use it properly.
For example, many people have mentioned so far that PBL takes 3 hours to learn something that will take 30 mins in a lecture.
But do you really expect to learn NEW information in PBLs? From my personal experience (and I've nearly finished the campus-based part of my curriculum), PBL is not for learning new things, but a way of applying what you've read in textbooks (or heard in the lecture) to CONSOLIDATE the knowledge.
For example, we recently did a series of problems on sexual health.
It's one thing for me to sit down with a physiology textbook and read the reproductive chapter from start to finish, but I am able to retain it far better by discussing it in a PBL setting - for example I might answer someone's question regarding a tricky topic, and in the process of explaining to them I can add layers to my own knowledge. In the same way, I might ask the group about something I have trouble understanding, and realising that I didn't know something that everyone else did makes me go back to my books and understand it more thoroughly.
Of course it would be troublesome if all your contact hours were PBL - but I don't think any school runs it this way. When lectures and labs are combined with PBL, I think it can be an interesting and intellectually stimulating way to learn.
But I do realise that you guys have the BOARDS to study for, which appears to be more about memorisation than in-depth understanding. So given this fact, I can understand why you guys hate PBL so much.
Regards