Obama had no follow through on anything. His entire presidency was one big compromise to the right. Medicare for all turned into forcing everyone to buy insurance, Guantanamo remained open, the number of troops just kept increasing in Afghanistan and Iraq, genocides in Yemen and Libya happened, bombs were flying like they hadn't done since the Vietnam war, the biggest mass deportations in US history were undertaken and border kids were put in cages.
Democrats didn't care back then because the optics of his presidency were much better than the actual policies. Just look at him today, he's the Netflix president. American liberals always make fun of republicans for voting for the guy they would like to have a beer with, but they themselves would love nothing more than to share a Spotify playlist or a book club with Obama.