To a few of the other Reviewers: Um ... Hello? This is an expansion pack, NOT a new game.
Oh well. Of course, for the rest of you who understand what this game is supposed to entail, if you like WoW then you're in for a treat. I love this expansion pack. The new levels, monsters, dungeons, quests and Death Knight class all come together to make an outstanding "Expansion" to what was already a great game.
Is this game going to change your opinion about WoW? No. If you think WoW is boring, repetitive, cartoony, just for kids, lacks PVP, Lacks depth, just a grind fest and so on and so forth. Well, just keep on truckin'. If you enjoyed WoW and it's last EP "Burning Crusade", then this is a must have. WOTK adds alot more of the same things that captivated you before. Once you step into Howling Ford and take a look at the breath taking scenery, a sense of awe comes over you.
This game has all the polish you'd come to expect from Blizzard. Even if you just play up until you hit level 80 then quit, I think it's worth it. There's alot of interesting quests with a great story. Plus all the new areas are really cool.
Great game. More of the same, but that's a good thing! :)