well one thing is sure, he abandonned first wife and kids, one of the kid became crazy and in an asylum. First wife helped him thru tough times and he left her for another woman without giving much of a shit. Also most of his work are theories stolen from other people, and at the end of the day, a theory is only a theory.
Also built one of the most evil inventions ever conceived by humans. The nuclear bomb.
He was just a human being, smart, figured out stuff and also invented the nuclear bomb that also has consequences. No not just the cold war, usa, russia, or today israel being trigger happy with their nukes...
Remember what he said about world war 3 and world war 4? Yeah... Brilliant.
The other thing we can be thankful for is increased cancers from decades of nuclear bomb testing by western nations and russia.