How effective was Reconstruction?

1. Could presidential Reconstruction have succeeded if politically skilled Abraham Lincoln instead of politically inept Andrew Johnson had been president?
2. How truly "radical" was "radical Reconstruction"?
3. How did both Southern and Northern racial attitudes shape REconstruction, and what effect did REconstruction have on race relations and the conditions of Blacks? Did Reconstruction really address the problems of race?
4. Was Reconstruction a nobel experiment that failed, a vengeful Northern punishment of the South, a weak effort that did not go far enough or  the best that could have been expected under the circumstances? What has been the historical legacy of Reconstruction? (Consider the 14th and 15th Amendments)