i have heard something that most people will get Cs, and only the top 2% or something will get HDs, that was in my lit unit anyway, (we're not supposed to know that!!), but I dont really get it anyway, given that there is no scaling involved or anything, no ranking etc.
But our uni's really good anyway, not too hard to get good marks. Just do the reading (eventually!) and attend lectures and you should be fine. Saying that, I'm in education...not really a brain strain, but oh well...