Best: Cleveland, Fillmore (What can I say, all things Buffalo!)
but really:
Best: TR, Lincoln, Jefferson
Worst: Clinton, George W ( I agree with many that it may be too early to judge these men, and of course there is the bias of recency. But 50 years from now they will be talking about these men single handedly dismantled America's business/manafacturing infrastructure in favor of Corporate Multinationals)
best ex-president: Carter