The things that irks the couples I know who went through Pre-Cana are A. the lectures over stuff they already have discussed like budgeting, etc., B. the "fake news" about birth control and NFP (one woman I know was quite angry about the false information about the Pill causing breast cancer because her mother had cancer), and C. the fact that some of the couples and priests seemed to encourage traditional gender roles.  Rather than herding people into a classroom, it would be better if there were couples willing to mentor newlyweds.  Couples could be matched by their interests, future goals, etc. so that two young professionals aren't being mentored by an Opus Dei couple with eight children being homeschooled.