The current narrative that FDR was universally idolized is due to the leftist penchant for shaping history to suit their needs and views via the media and higher education, both of which are controlled, run, and populated by their acolytes.
There were many who despised and detested him, and for good reason as we recognize.
But I have to also admit he largely did a good job for getting the groundwork laid for getting this country on a war footing (from both an industrial perspective, and a political perspective) at a time when the majority of Americans were indeed isolationist.
And I also give him credit as a wartime leader, but not without recognizing mistakes which were made. It happens. We don’t want to fall into the liberal trap of throwing out the baby with the bathwater in that respect.
I am no fan of Roosevelt in any domestic area (even if I like some of the large projects like the Hoover Dam, etc...but for different reasons) but I give him his due as a wartime leader.
FDR tried government (Army) building military equipment..
Marshall told him to get the big guys involved or else..
He had enough sense to know that his way was failing..
The first eighteen months of the war the US had crap to fight with..