While it's interesting to hear someone else's perspective. Panda's observations are far from what really happens in a session. PBL is not group study. You really don't learn all that much during the session, although often someone will explain something in a way that leads you to one of those "ah hah" moments and you can finally say, "I get it!".
We meet for two hours three days a week and determine the basic science issues we need to learn about to understand the current case. Unlike lectures where students study the powerpoints and the streamed lectures, we read the books-- cover to cover-- more than once. Doing it right takes a little experience. The first session can be a little like Panda desribed, but unlike that situation, the facilitator doesn't teach you much as first except where to go to find the answers you need. W only have PBL once a week during the first 10 weeks when Anatomy is going on. All you really learn during that period is how to do it right.
Unlike Panda's scenario where the alpha students quickly take over, the facilitator is charged with making sure that everyone participates. 20% of your grade comes from the facilitator. As a group member you are responsible for involving everyone in the group as well. If you don't involve the group, instead dominating the topics, your grade will suffer.
One other strength of PBL is that you cover the material several times during your two basic science years. What happens in a traditional curriculum when you study Physiology for one year then don't pick it up again until it's time to study for the boards? Do you really retain that material or did you just learn enough to get by for the test during first year? OTOH, in PBL I'm still reading Histo, Embryo, Anatomy, Physiology, for example all over again in the second year. It's the repetition that helps you understand things. You learn some facts the first time through, but the second, third and fourth times through a topic you start picking up so many of the "little" things that you glossed over the first time.
It's similar to systems based learning in that we tend to have "blocks"of cases sometimes. But instead of covering it once, you'll go through the anatomy, histo, embryo, physio, pharmacology, pathology, immunology, of the heart several times in two years. You'll revisit it a number of times until you really gain an understanding. But you'll also see patients with several different problems, so you'll get a good pictures of how the different systems interact with each other as well.
Fortunately, we switch group members and facilitators at regular intervals so you get to see a mix of things and work with different people. Some of them you may not like as much as others, but this is just like the real world where you are forced to work along side people you dislike.
The bottom line is I like it, but you may not. Whatever works for you is what you should pick. At least there are options available for us these days.