I agree with many here I'm a Civil War person. While McDowell's plan did fail in the end, this lay more with his subordinates rather than him. He devised a very good plan just in the end it failed simply because most of his subordinates, as well as him, were new to command and things did not get carried out well. If the Union generals in command of the flanking force would have made a concerted attack instead of piecemeal assaults, as McDowell planned, they should have been able to drive the Confederate flank back long before Jackson and others arrived to stall then push back the assault.
On this I agree with the ratings and maybe even giving him a 1 point bonus in attack as like I said it was more the failing of experience of everyone involved that lead to the failure not really anything of his.