There is way too much competition for the majority of the quests in northrend. In peek time, leveling in wrath zones is nearly impossible. Every quest that takes 3-5 min on retail, takes 10-20 min here. That is not because of how faceroll retail has become. Its because spawn rates of quest related items, mobs, minibosses etc on this server are designed for much smaller realm. When there is 10 + players on a same quest, everything related to that quest needs to spawn pretty much instantly, otherwise camping and frustration(in my case) is inevitable.