Grant also had Donelson, Henry, and Vicksburg, which is arguably the most brilliant campaign of the war.
Even in the Overland Campaign, Grant showed great imagination and operational flexibility. The initial conception and movement were perfectly sound. The movement to the North Anna was creative: a baited trap that Lee didn't take. The flanking movements across the Pamunkey and James were brilliant; Grant breached multiple river lines without major battles. But he was determined to deny Lee any opportunity to take the initiative; he wanted to defeat Lee in the field before the war became a siege; and he began with the perception, IMHO correct, that the Army of the Potomac had had Lee on the ropes on multiple occasions, but that its commanders had failed to press the advantage. Hence his willingness to pound away when he got Lee to grips.
It's also important to remember that during the Overland Campaign, other federal armies were supposed to be advancing on all fronts. Grant made sure that the Army of the Potomac did its job. Had David Hunter in the Valley and Ben Butler on Bermuda Hundred done theirs, the campaign would have been very different.
I had an exchange with another Freeper who contended that Gen. George H. Thomas was the best Union General. He contended that Grant was jealous of Thomas because he was demanding offensive action in middle Tennessee before Thomas was "ready". The simpler explanation is that Thomas was focused on his own knitting to the exclusion of Grant's overall strategic concept. So while Thomas may have been proven 'correct' by his victory at Nashville, we'll never know how many casualites this cost Grant in the East because of insufficient 'pressure' in the vital Western Theater.
I'm a fan of both Grant & Thomas but Grant held "The Big Chair" so I'm not willing to make direct comparisons at that point in the war.