"Despite some promising open data initiatives, the executive branch under Obama was, on the whole, more secretive than ever. Since 2009, press access to the White House has been notably restricted, whistleblower prosecutions have spiked, and Freedom of Information Act (FOIA) lawsuits against the federal government have reached an all-time high."
It's worth pointing out that knocking out Ghaddafi almost directly led to the rise of ISIS- and the decision to bomb Libya was 100% Obama's alone.
On the employment rate, there's this chart which illustrates it nicely. The line is the percentage- not total number- of people actively in the labor force. That is, what percentage of people of people old enough to, and able and willing to, work, are in fact actually working.
You can put your pointer on the chart and it'll show you exact numbers and dates. January 2009, when Obama was inaugurated, 65.7%. January 2017 when his administration ended, 62.9%. As I recall (off the top of my head) that's the equivalent of something like two million more people out of the workforce.
As for what good Obama did, the first thing that pops into mind is he helped restart our nuclear power program. He didn't do much, unfortunately, but for the first time in some 20 or even 30 years, he did in fact help clear the way for new nuke plants.
Keeping in mind that newest nuclear power plant in the us, before the Watts Bar Unit 2 plant came on line in 2016 (although construction first started in 1973!) was Watts Bar Unit 1, which came online 21 years ago.
Beyond that, I'm at a loss. I have no doubt he did many small things that I'd consider fairly positive, but on a larger scale, those are almost certainly far outweighed by the negatives.