God damn it, the fanboys of the slaver general are going to be even more intolerable in this timeline.
Well. his record was impressive from a tactical perspective OTL. However, you are unfortunately correct, fanboys will be all over his record TTL. Expect some to be even more insufferable.
That said, he hasn't really faced off against a slew of extremely talented commanders. McClellan was good enough, but his record against Lee's audacity is spotty at best, while Rosecrans did beat Lee in West Virginia in 1861, he thought he had more of a handle on Lee than he really did. The combination of generals who - for good reason mind you - took their time in building up their forces against an enemy has meant that Lee has also had time to think and plan contingencies. The retreat to Mine Run being the big one where he has indeed managed to just hammer Rosecrans.
Whoever Lincoln appoints next will have their work cut out for them, but even Lee is going to find it tough going. He didn't get off lightly in this fight either! But. there's a few more factors we will be getting into come August 1864.