Well I thought leveling was horrible, I never enjoyed that(My friend loved it though, she had every class level 80), I believe the game begins once you hit the highest level (Was level 80 for me, currently level 85)
You would do instances(Dungeons) daily and get tokens that would go towards armour, Raids(10 or 25 man dungeons) weekly for awesome armour as you would not always get what you wanted but you knew what you were after.
Going to the battlegrounds with your friends and capturing a flag and watching your team mates slaughter everyone who comes near you, vent was constant, it was used for just about everything
Imagine a far more advanced version of Runescape wildy where everyone does there own thing, like someone would teleblock, someone would barrage and so fourth, it's like that for EACH individual class.