Plus, I strongly support the Great Society. LBJ signed the Civil Rights Act and the creation of Medicare. The good he did greatly outweighs Vietnam.
Most of the "good" he did amounted to greatly expanding the size, scope, and power of the federal government. The Great Society and Medicare moved America towards a degree of Socialism that we've grown so dependent on, it would be impossible to turn back the clock.
As far as the Civil Rights Act, it's a shame that this had to be done on the federal level - but then, that's not LBJ's fault. That's the fault of the racist rednecks who demonstated that states can't be trusted to abide by the U.S. Constitution.
At the end of the day, Federal power expanded more under LBJ than under any other president besides Lincoln and FDR. But those two at least had national crises to blame for their expansion of government.