FDR has an excellent reputation do to the fact he only had to deal with Democratic Controlled Congresses (and then with overwhelming Democratic Control of Both houses). FDR rarely had to crack the whip (and when he did, it was mostly to keep the left wing of the party in line, After 1936 he was less tolerate of the right wing but he never truly embraced the left wing of the party even after 1936). FDR thus tended to accommodate the Right wing of the Democratic Party, reserving his veto power to veto bills supported by the Left wing (Which included paying the WWI bonus early, FDR veto the bill to do so, but his Veto was overridden by Congress, with even Republican voting to override that Veto).
LBJ had a less compliant Congress (With a lot of soon to be Republican who were still Democrats at that time period). LBJ decision to fight the longest Filibuster in History to get the Civil Rights Bill passed is something both JFK and Obama (as while as Clinton) would have avoided. The problem with Washington right now is we need a LBJ or a Truman, someone who can bend with the wind (as both Truman and LBJ did during their administration, for example LBJ's expansion of the War in Vietnam, something the GOP pushed and most Americans agreed with till 1968 when LBJ started to reduce the number of troops in Vietnam) AND also fight against that wind when they can (LBJ and the Civil Rights Act, his "Great Society Programs", Truman and his efforts to get the economy return to a peacetime economy without a major depression, the first efforts on Civil Rights and his defense of labor with his veto of the Taff-Hartly act).