Sometimes you don't have any choice. On Android, for example, you have to follow the design guidelines if you want to get featured. However the design guideline

Sometimes you don't have any choice. On Android, for example, you have to follow the design guidelines if you want to get featured. However the design guidelines say your actions should be tiny unobtrusive icons in the action bar. Users miss these all the time in user testing in my experience. If you made them big, glossy, 3D looking buttons people would find them, but then you'd violate guidelines. So often we have to put these tutorial overlays up instead with big white arrows over a darkened screen pointing out the actions.