Best/Worst of VMA Performances: http://www.ew.com/ew/gallery/0,,20302134_20627757,00.html?stitched#21209874 Green Day, ''Let Yourself Go'' Leave it to the sole punk band on the bill to paint an X on the ground and call it a stage. Playing a loud-fast bruiser from their forthcoming album ¡Uno!, Green Day kept it classic: no neon pyramids,no dancing lips, just the best bad attitude of the night. (''Who wants to be on TV?'' sneered Billie Joe. ''Let's go!'') Extra points for wearing that Pussy Riot t-shirt, backup guy. B+ "backup guy"