Whenever I think of the current state of combat, I recall rogue blogger Aldriana's insightful post from when the Blade Flurry change was first announced. Blade Flurry has always been the spec's signature ability, but now it's transcended into its only ability. Combat rogues currently fluctuate between "just ahead of subtlety" and "best in the game" based on whether or not Blade Flurry works on a particular encounter. Blade Flurry makes or breaks combat rogues, making it incredibly unbalanced.
Combat rogues are lucky that Magmaw and Halfus are relatively easy heroic encounters, because doing six-digit DPS on Sinestra would've certainly drawn the developer's attention. At one point in time, Blade Flurry was simply an extra perk of the combat tree. You could pick up some extra damage if there was something nearby to cleave, but it rarely decided your outcome. Even on ideal Blade Flurry fights like the Twin Val'kyr, combat rogues weren't that overpowering. The new BF design is impossible to balance against.