The operative words being “win the war”. There us no second place prize in war. While his tactical abilities were average at best, his strategic thinking was head and shoulders above his peers. Before the war ended, Grant would accept the surrender of 3 Confederate armies.
Winfield Scott wrote down the plans for how to win the war before Ft. Sumter was even fired upon.
Generals & politicians laughed him into retirement. Ironically it played out almost exactly as he wrote them down in 1861.
Grant’s success was in that he used his resources. And he was the only one who really did. This is where others like the timid McClellan, the over-confident Hooker, and the overly defensive Meade couldn’t succeed.
McClellan was so timid that he over-estimated the Rebel forces during the Seven Days campaign as outnumbering him almost by 50,000 men.
Napoloen won battles similarly to Grant. Charge, charge, and charge again. He won, but the cost was a lot higher than it should’ve been unfortunately.