Most of his legacy is an unmitigated disaster: Viet Nam, the War on Poverty, the much overlooked budget unification act -- when the Social Security budget was consolidated with the government operating budget, so that we could "afford" both a War in Viet Nam and a War on Poverty. All illustrate the utter failure of "good intentions".
Meanwhile, all the positive parts of his legacy (the Civil Rights Act, e.g.) were fostered by cynical, self-serving political calculation -- i.e., "bad intentions".
As a nation, and on balance, we would be better off without LBJ and his dubious works.
LBJ was also an immoralist, like JFK and the Felon, using WH secretaries as his personal concubines. RATS are all scum, but put them in the Oval Office and they become sewer scum.