Obama was all form, little substance. I think he was an ineffective president who squandered a lot of good will and after the crisis of 2008-2009 had an opportunity to refashion a lot of policies both domestically and internationally but failed to do so. He did indeed produce Obamacare, though given his majority in both houses could have been more sweeping reform of the healthcare system. Yes, the economy recovered as a result of the Fed's bulging balance (printing money), but inequality didn't narrow and you could argue that taxpayer led bailout of Detroit's automakers has not really produced a lasting change for the industry and the area.
And his foreign policy was a disaster, starting with misreading/mishandling of the Arab spring, his ill-advised intervention in Libya, the "Assad must go" policy in Syria which was a disaster, his handling of Russia/Ukraine, inability to handle ISIS, not closing Guantanamo, the exponential increase in drone killings etc. He was doomed from the moment he chose people like HRC, Susan Rice, Samantha Power, John Brennan, Robert Gates in key foreign policy and security positions, as those are firm believers in US global leadership who never saw an international issue that didn't think the US should play a major role in "solving".
Obama did make progress on climate change, and he was a thoroughly decent man - that's clear without a doubt.
yikes