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Just completed 'the jade forrest' zone, got the achievement too for completing all the story lines. Play time about 9 hours - not rushing just heading off in the general direction and seeing what was about.
Thus far I think this have been the best leveling experience of any WoW expansion, lots of variety in the quests, sure there were kill quests etc but they were over quiet quick and were normaly just a filler quest in the same area you had to complete a story quests. Main quests had voice over and there were 3 or 4 cinematic sequences. Phasing was used but used extemely well at least from a solo players experience.
If I were to rate MOP on this zone alone I'd give it an 8.5/10
Anyway I just landed in yhe Valley of the four winds, plan to do a dungeon or two before I explore... lets see if Blizzard can keep it up?