I believe Jiang Wei was a great strategist of his own time as well.
Heck, the administration Kongming left to Liu Shan was comprised of great men (Jiang Wan, Jiang Wei, Fei Yi, Dong Yun, etc). Only when these started dieing, and incompetent men took their place, the corruption in Shu (Which was already high by the time of the Northern Expeditions) rose gigantically. But Shu never had a chance against Wei, even with Zhuge Liang. I believe the defining moment was the death of Pang Tong. If Pang Tong hadn't died, I'd reckon things would have turned out differently. If Zhuge Liang attacked from Jing (Which is hard to believe that Zhuge Liang would lose to Wu) and Pang Tong from Yi, and Sun Quan sent his men through Hefei, something of notice could be achieved. Whereas isolated attacks by Zhuge Liang, through difficult terrain, against an Empire far more populous and productive than Shu, was doomed from the start. Only Zhuge's remarkable talent managed to put Wei on the defensive.
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