If there's one trend that I am enjoying in Firelands, it's that the encounters are much more rogue-friendly than those of the previous tier. We're not swapping targets as often, and there are several fights where combat rogues get to shine via Blade Flurry. There are also role-based encounters like Rhyolith, where our DPS is less important than our reaction time and planning.
Beth'tilac and Baleroc start very differently, but they both finish with a race to beat the ever-increasing damage being dealt to the tank. Rogues are particularly effective against both bosses, especially since both are simple fights that let us establish our rotations. Rogues prefer to focus on single targets, as opposed to specs like boomkins and shadow priests that prefer tossing their DOTs around.