"Did it hurt much when you fell from Heaven?"

As we compare Hero and Claudio's relationship with Benedick and Beatrice's, it may be too easy to draw the commentary that "young love is prone to failure" while "an older, mature love is grounded and real."  This may be true, and certainly something Shakespeare frequently hints at; but what else is he saying about love and relationships in MAAN? What makes for an enduring love? Is marriage the seat of contentment?  Should husbands fear their wives? Is friendship more important than love?