Originally Posted by
Rasula Elfbiter
Wrong. Old Horde's success was mainly due to the Alliance being unprepared for a massive war, not fully knowing what they were dealing with. The only kingdom fully ravaged was Stormwind. Rest held the line.
Scourge, on the other hand, fully decimated Lordaeron (a kingdom twice the size and strength of Stormwind), Quel'thalas and Dalaran, also fighting its way to Mt. Hyjal across Kalimdor (mainly as the Legion's cannon fodder, but still), and waging two successful Northrend campaigns.
I doubt Old Horde was any threat to the Legion, they were simply shock troops held on a leash. I do agree, however, that Ner'zhul did screw the Legion up pretty bad.