WoW: Wrath of the Lich King - Review @ Eurogamer

Wrath of the Lich King ought to be stale - but it inspires wonder. It ought to feel dated - but it makes WOW's newest rivals look clumsy. It ought to seem derivative and formulaic, one step behind the curve - instead, it takes the bar WOW set for quality in MMOs and casually lifts it far out of reach.
Blizzard hasn't repeated the excitable, haphazard and slightly barmy revisionism of first expansion The Burning Crusade. Instead, it has brought to bear every ounce of its legendary perfectionism, craftsmanship and attention to detail. It has made the world's best MMO better, and - here's the remarkable thing - it has done so in a way that works for almost everybody, in almost every situation.