Jim Gavin was the youngest division commander in the US Army in World War II, and I've never read any opinion to contradict his reputation as one of the best. To the degree that one can trust his own account in this excellent book, one of the reasons he was so effective was his propensity to lead from the front. Indeed, he recounts personally scouting far in front of his own division's lines in the Huertgen Forest as well as during the Battle of the Bulge--so much so that it could fairly be considered reckless. But therein lies the roots of his only real criticism for Dwight Eisenhower, whom he otherwise greatly admired: that he tried to manage battles and campaigns from too far in the rear.
Gavin's career really is amazing to reflect upon. He got into the Army's nascent airborne program early, and through his effectiveness as a staff officer was put made the first commander of the 505th Parachute Infantry Regiment, part of the 82nd Airborne Division. Before long his boss, General Matt Ridgway (also an excellent commander) was promoted to command the XVIII Airborne Corps, composed of the 82nd and its sister division, the 101st Airborne, so Gavin was raised to command the 82nd, which post he held for the remainder of the war. The 101st's activities during the war in Europe has gotten more coverage in the popular media in recent years, particularly with HBO's series Band of Brothers (2001), but the 82nd was right there with them in all the major campaigns in the ETO: the Normandy D-Day invasion, Operation Market-Garden in Holland, and the desperate defense during the Battle of the Bulge. After the Bulge the 82nd even took a turn in the horrible Huertgen Forest, succeeding where the 4th, 8th, and 28th Infantry Divisions had failed before them. Gavin describes all these battles in fascinating detail from his point of view as a commander, though the reader may wish to read other histories for additional context of his division's activities during these episodes (e.g., MacDonald's A Time For Trumpets for more information about the situation in which the 82nd found itself, and about its German opponents).
Gavin includes an interesting coda about the postwar deterioration of the Western Allies' relationship with the Soviet Union over Berlin, as well as about the chaos surrounding EIsenhower's eventual decision to leave Berlin to the Soviets while focusing on destroying the remnants of the German Army in southern Germany. This is an aspect of the war's late history that is not often discussed.
Gavin's amazing abilities as a leader and a diplomat (which any high-level military commander must be in part) are evidenced by his postwar assignments, including eventually being named US ambassador to France. Add to that his ability to write a ripping good yarn and you have a very admirable American hero.