If you're Horde, just skip Boring Tundra. It sux.
Sadly, the Northrend questing experience wasn't a lot of fun all round for me as a multiboxer, but Howling Fjord, Dragonblight, parts of Scholozar and Storm Peaks were enough to get me to 77 and open up Icecronw. I skipped the rest, and have no intention of going back for 'em either.
Connect With Us