Tek - I sure wish we could level by camping instances in Wrath. My toons are all level 72, and a run of UK (for I believe the 13 or 15th time so far - literally) net my group about one bubble of xp. ONE. Wow, that's a lot of runs to level up.

It appears that questing is the fastest means to level that I can see. Even tried grinding a troll open ground area for xp, but the xp's just not there for five toons.

As far as the storyline, they've fleshed things out and added a lot of new, novel ideas (to WoW at least) to questing. While they may re-use some characters, that only helps deepen some storylines. You *need* repeat characters to build up "big bad guys" over time. It also helps players feel like they know the enemy.