I've come to the conclusion that besides a couple of small time battles along the Cumberland against subpar leadership and accepting the surrender of Lee, Grant was an unimpressive tactical general.
Many times he simply used his superior numbers until the rebels had to back out or give up due to attrition. Vicksburg and The Wilderness are a couple of examples.
Even when Lee surrendered at Appomattox, he was simply overwhelmed after accidentally running into the entire Army of the Potomac on their way to North Carolina.
Outside of his tenacity, I'm not impressed with his performance.
I do realize I am but an infant in my quest for Civil War knowledge, but if I am wrong, I'd like to hear examples
of his tactics winning battles onstead of just having superior numbers.
But is tenacity and persistance such a bad thing in a general?
"Nothing in this world can take the place of persistence. Talent will not: nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not: the world is full of educated derelicts. Persistence and determination alone are omnipotent." - Calvin Coolidge.
As others have stated above, Vicksburg is not really an example of attrition. He outmaneuvered several Confederate forces, beating each force in land battles that he met, and ultimately cornered Pemberton after winning battles at Port Gibson, Champion Hill, and Black River Bridge. After that, it became a siege.
The Wilderness is complex. It is part of a larger campaign, and it also involves Grant with a complex command structure - Meade, Burnside, and Sheridan chaffing under Meade. Meade wanted tactical control of the army, while Grant had to make the Army of the Potomac work and do its part while overseeing all the other Federal armies, especially Sigel's command in the Valley and the Army of the James at Bermuda Hundred.
In terms of Grant's tactics winning battles, Grant was an army commander. army group commander, and later commander of all Union armies. Most of the tactics he dealt with were higher level or grand tactics, operations, and strategy. Most tactics as we consider, troop deployment, etc. are done by corps, division, brigade commanders, etc. For an examination of Grant as a tactician or his role in primary tactics, look at some of his battles commanding the Army of the Tennessee and look at his grand tactics or operations as the Military Division of the Mississippi commander at Chattanooga and over Meade's shoulder in Virginia.