I played a Rogue back in Vanilla during arguably the height of its popularity. What happened since then? Why are Rogues the least popular class in WoW at the moment?
If I had to guess, I would say it's because of Combat. A lot of players play(ed) a rogue solely for this spec to be able to duel-wield Swords, Maces, and Axes. That isn't the case anymore, a dagger is pretty much required in the OH.