Not at all important for me. When I ride, I never look at my board and stare at the top sheet, so top sheet graphics doesn't matter at all. I bought my board based on performance, not on top sheet design.
About the only time anyone can see the graphics on my board is when I'm at the lodge and the board is on the racks, so what goes on outside the lodge isn't really my concern, nor should it be. What do I care for how a 13 year old thinks of my board when I'm chowing down a pizza?