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Sylvanas - she has taken a much more active role in WOTLK, especially since it's Arthas and revenge time, retaking her city from a traitor, raising suspicion among her "allies", in a word, Sylvanas is a mulit-layered leader that brings complexity to the Horde

Now for the Alliance, you could start as Alliance, and it's all right, but the moral and pride are all but non existant, there is an occasional "Glory for the Alliance" and such, but it's quite meek from what you have seen, and our leaders and lore characters are a bit stale.

Varian - supposedly Thrall's counter part when he was first released after how many years? The Alliance had no defacto leader prior to 3.0. Varian was supposed to become a Thrall like presence to the Alliance, and you really needed one, turns out he became Garrosh's counter part more than Thrall's
What kind of honor and glory would the Alliance get with a Orc killing crazed gladiator whose narrow mindedness, and inability to try and make bridges not burn them be good for the Alliance. Aside from one quest-line you fight alongside him. Varian's a good addition and a step in the right direction for more Alliance activity and presence, but it'll be interesting to see how it goes.

Jaina - she is an exception, probably the most level(WoW powerleveling) headed person on the Alliance, despite her being a veteran and ambassador for her people, Jaina has been thrown into a pit of hungry lions, and shes dripping wet in BBQ sauce. She could turn the events around if she tries hard enough, but it only seems in my opinion that she is falling on deaf ears, plus you applaud her upped role in WOTLK, with the entire "Arthas your former fling is now the ruler of the living dead thing", those relationships don't tend to work out :) Plus active quest-line as well

Bolavar was a bit too in active, he could be Saurfang's counterpart, but wish he had more of an active role prior to his grand finale)

Other than those two, the rest of the faction leaders are pretty stale, Bronzebeard doesn't do much, High Tinker is too busy mopping hoe he got screwed over to do something about his people rebuilding a new city or something, Velens the new guy and Tyrande, she has had an active role.

So what is it got to take to make the leaders and general Alliance population to feel proud of who they are and actually become part of this world, rather than have their leaders simply wait for something to attack them? Maybe Cataclysm will have them taken more active roles, or at least an in game event like Stormwind where Varian was helping others, maybe do that with the other leaders.

Thank you for reading and have a good time.