He enacted genuine change, it just always takes a few years to come into effect, and he was working against a Republican controlled House and Senate that publicly bragged about how they were going to just time him out of office.
There's an article discussing his reforms in 2016 here after another police shooting.
https://time.com/4398392/obama-police-reform-report-task-force-on-21st-century-policing/
There's a reason that the Minnesota police union chief took to the stage at a Trump rally last year and said -
“The Obama administration and the handcuffing and oppression of police was despicable,” Kroll said, an apparent reference to post-Ferguson investigations in cities with ling histories of police brutality and killings that had led to a series of Justice Department consent decrees. “The first thing President Trump did when he took office was turn that around — he decided to start let cops do their job, put the handcuffs on the criminals instead of [on] us.”
It's not because Obama and Trump are the same.
Filibustering became the buzz word of the Obama era. I have mixed feelings about Obama - I fully acknowledge those mixed feelings are on the basis of my unrealistically heightened expectations of his time in office - but I really believed he was a fully progressive politician and that was something he most certainly was not. It cannot be ignored though, that he was having to contend with a GOP controlled house and senate. He attempted things, and it was always watered down versions of what I actually wanted him to do, shich still got slapped down anyway- it was an impossible task at times.