Scryll, don't forget, Rogues are the BIG DPS class, so it's blizzards way of maintaining class balance. Next in line are mages and locks, but they can't really take hits as they don't have the dodge that Rogues do. Rogues can vanish, Mages can go invisible, but Warlocks dont' have an agro wiping ability. Hunters have lower DPS, but have better armor, and have more agro management abilities. Again, it is all about balance.
Finally the nerf on flare makes it now totally useless for PvE content, and as for PvP content it didn't really make any difference to a good rogue anyways, as they could just sap the hunter anyways.