I wouldn't trade PBL for lecture ever. I learn well by myself, and the concept of going through with cases is going to better prepare us for real life doctoring. On the other hand, if you don't have a willingness to learn, and a willingness to go a little over your head, you probably aren't going to make it well, and you definately are going to annoy at least a couple people in your group. You have to be able to work well with others, as well as know that it's OK to struggle.
[mini pbl rant]
There's nothing that annoys me more than that one (sometimes two or three or more) student in the group that always bitches because they are in over their head, because they took last weekend off, or they don't understand the material, and so try to hold up the whole group. It's like, if you can't pull your weight, work harder, don't try to make us work less hard.
You will have one one of these people in your group. You will hate them. You will deal with them. And you will be a better person for it.
[/mini pbl rant]
If you have any LECOM-B questions, feel free to ask me.