YouGamers writes: "World of Warcraft is the king of the hill. Over 11 million players worldwide and still growing even as competitors try to nab a bite of the market so utterly dominated by Blizzard. At the top of the hill, with no serious competitors in sight to challenge the status quo and with piles of money pouring in every month. What does Blizzard do? They raise the hill. Enter the second World of Warcraft expansion pack, Wrath of the Lich King.
Burning Crusade successfully established what a WoW expansion should contain - raise the level cap by 10, add play areas and quests for those 10 extra levels, introduce a reason to create a new alt character, throw in a whole new set of endgame content and expand every talent tree and tradeskill to match the new level cap and content. Wrath of the Lich King repeats the trick, sticking to the established formula. Old endgame content of Burning Crusade is replaced by a whole new continent of Northrend."