Most of the students I talk to who attend schools where there is a traditional, lecture curriculum have a tendancy to skip class.
My school is pbl.
In reality, I really won't know how helpful PBL is until I am on the wards. Usually, I have fun on the morning that the case is introduced, when we all sort of brainstorm ideas, questions, and differentials. It is also rewarding to understand how an intricate biochemical or biomolecular disorder may present at a clinic as opposed to in a textbook.
That said, here are somethings I don't like about PBL:
1. Group is too large.
2. Can be intimidating for people who have less of a science background.
3. If PBL is graded, people may be hesitant to ask questions and have important themes clarified, simply because they do not want to seem ignorant.
4. Also, as a result of grading, a large group size, and intimidating students, some people just shut-up.
5. The PBL case always follows the particular week's course content. A patient can have shortness of breath and tightness in his chest, but unless it's "heart week" at your school, you will probably be discouraged from bringing up the heart.
These are my gripes. Overall, it may be worth a try. I'll let you know in a few years!