One thing that has not been mentioned is that Rommel, as the officer responsible for oversight of the construction of the Atlantic Wall, WAS, by definition, guilty of War Crimes.
The fortifications, tank traps, beach obstacles and other features that comprised the Reich defenses were constructed by Organization Todt. Well over 90% of the labor used in the construction projects was drawn from Soviet POW camps, imported slave workers from the East and (albeit in a fairly small percentage of the 1.4 million total workers) Jews from the Camps. These non-German workers were treated poorly, fed insufficiently, and died with horrific regularity. As Officer Commanding, Rommel has the responsibility for the varied War Crimes and Crimes Against Humanity committed by Organization Todt in his AO.
While Rommel was not a Nazi, and conducted himself as well as any Heer officer toward Allied POWs in the West, he was also never placed into a position where his reaction to something like the "Commissar Order" was tested. Whether his clean reputation toward enemy troops is due to deep personal commitment or is simply thanks to being assigned to the "civilized" theater of the Reich's war is uncertain. What is not uncertain, although not regularly discussed, is the close relationship he shared with Hitler, dating back to his assignment as commander of Hitler's military escort in 1936, a post he maintained, with increases in both rank and access to Hitler until 1939. He was promoted to General in late summer of 1939 at Hitler's direct instruction. This connection would have weighed heavily in any decision regarding his being brought up on charges after the war.
It is possible, even likely, that Rommel would have escaped the gallows for his involvement in the offenses committed under his authority, but that he would have been brought to trial is a virtual certainty. In all likelihood his fate would have closely tracked that of Admiral Karl Donitz, a prison sentence followed by an honored retirement in Germany as his positive characteristics were those remembered.
As far as his reputation in the West as a whole, the best thing that could have happened for it (although not for the man or his family) was his association, as late and tenuous as it was, with the July 20 Bomb Plot. Being forced to do "the honorable thing" by the Nazis, allowed his legacy to end as a heroic officer, with all the unpleasant facts left as mere footnotes to his justly earned fame as "The Desert Fox".