Just a note, Rogues are viable either way. There are plenty of talents in the combat tree that make dual-weilding Swords, even maces efficient for simply frontloading damage. One talent lets you have a chance at an extra attack with each swing with a sword. With Maces, a talent allows you a chance to stun the target, as well as the added benefit of Maces not being in as high demand as 1h Swords. Dagger/Subtlety rogues are probably more deadly, but rely on beginning the fight stealthed, and banking on stealthing out again. It just depends on what type of playstyle suits you. In any case, you can look at the available skills and talents in-game, as well as on this site.