Northrend slaps, full stop. It may not have the environmental diversity or incredible skyboxes of Outland, but the consistency of tone across the entire continent is pretty impressive when you consider how much content is available in that space. The overarching story ain't half bad either for an MMO expansion, feeling properly climactic for the end of a narrative started all the way back in Warcraft 3. The quality of the content and storytelling in Northrend is a bit more mixed, but there's still plenty of experiences I had in this expansion that hold a good amount of nostalgia for me. This was WoW's golden era, and it's hard not to see why.