Warlords are incredibly party dependant. The best warlords are the ones that give out a huge number of free basic attacks to their allies; however, only certain classes are capable of making effective basic attacks, meaning that in the wrong party a "lazy" warlord can be useless. As for rogues, all the builds have their merits except for the Ruthless Ruffian. However, when you get to Paragon, it's pretty much universally agreed that the "crit-fisher" Daggermaster paragon path is in a tier by itself.