MacArthur let his planes get strafed and shot to hell after hearing about pearl, was a pr hound, among other things. The two things that stand out the most about him though, was being relieved by Truman during the Korean War and also he was in charge of the removal of a Hooverville outside DC in the thirties. Eisenhower and Patton were also involved in this but I am pretty sure MacArthur was in charge(need to look it up). This turned out to be a huge embarrassment to Hoover, on top of everything else that went wrong.
Montgomery almost all the leaders who had to work with that guy seemed to dislike him, including Churchill. His most well known aggressive plan turned out to be a dismal failure.
Patton made his share of mistakes too; the raid on the prison camp, his supply lines were always a mess, and of course well known “slapping” incidents. On the other hand he made a number of predictions that did turn out to be true in a tactical and strategic sense about the fighting in Italy and Soviet Union (to name two off the top of my head). Patton also understood tanks better than most military commanders, he commanded some of the first tanks in WWI. Of These three I would rather have Patton in charge.