There was once a time where rogues were one of the worst soloing classes in the game. We have never had any tanking or healing abilities like the hybrid, and our fellow pure DPS classes have the advantage of ranged attacks. Rogues were simply wrecked by their enemies. While we had decent levels of dodge, our survivability depended entirely stunlocks to control our opponents. Against anything immune to stuns, we were pretty much worthless.
Times have changed. Rogues have reached levels of survivability that were previously fantasy. We remain the single best DPS class for toe-to-toe damage, and now we can actually last long enough to get the job done. Each of the three rogue specs has a purpose and a direction, and the title for top DPS spec is still up for grabs at level 85. Blizzard has already tweaked the mastery system for rogues several times to ensure that no spec is left behind. I'm looking forward to our bright future in Cataclysm.