I currently only grow two hybrid rugosas (Moore's Striped Rugosa and Linda Campbell). The more familiar I become with the class (which frankly very few are grown in Oklahoma) the more I am drawn to them. Both show a true hybrid leaf that is somewhere between the more crinkled rugosas and the smooth leaves of the modern roses they have been crossed with.
Below is my Climbing Rainbow's End sporting some gorgeously colored fall foliage. The smooth shiny leaves are just about as different from the rugosa leaves above as they could be. Both offer nice color to the garden even after the flowers quit blooming.
The final picture shows some bright red leaves on the young growth of Lavender Lassie. As new growth I think the sugar content must have been high and caused the richer color than normal.
If you find yourself uninterested in this post - don't worry. It will always be the flower that draws us to roses. However, if you find yourself more and more interested in things like plant structure, leaves, thorns, and who knows what else - don't worry. You have just fallen hopelessly in love with the whole rose.