I can't see how I got anything out of some of the lectures spring semester, and I don't know why this past semester would be any different. I won't mention any specific instructors, but I can honestly say that last semester there were some neuroanatomy lectures I sat through that did me more harm than good and all I got out of them was a headache. In retrospect, I wish I would have skipped about half of them and spent the time studying on my own--because in the end, I ended up teaching myself anyway.
Besides, the averages last year were quite high as well--and I can assure you that I was always at the bottom of the barrel then. I don't think the class mean has anything to do with my own personal performance in the MS-I year compared to MS-II year.
If you get more out of the material by attending lectures, that's great. I'm glad that you've found a learning style that works for you. I pick and choose which lectures I go to. There are some lecturers I benefit greatly from (Dr. Goljan is one of them). Other lecturers I consistently don't get much from other than daydreaming. Those are the ones I roll.
I'm not asking anyone to agree with my method because I really don't care what others think about it as long as it is working for me. If I feel it's not working, I'll try something new. Until then, I've decided that trying to passively absorb information from certain professors is not for me, and I would rather spend the time actively tackling the information through answering questions, drawing, making flow charts, etc.