They should really look toward the Cataclysm or Warlords models to get their inspiration back. Cataclysm Marksman was pretty cool since Steady Shots had a chance to build up stacks that would eventually give you instant free aimed shots. Warlords w/ 4 set was also pretty cool. A potentially mobile damage dealer that was rewarded hugely for using their Mastery well. Come to think of it, the old Marksman Mastery was pretty well designed. It rewarded you for thinking ahead of the game and being in positions to maximize its efficiency.