Kissinger and Lê Đức Thọ received it because they "jointly worked for a ceasefire and for bringing peace to Vietnam," though Lê Đức Thọ refused it and Kissinger did not attend the ceremony.
Obama received it nine months into his Presidency for "extraordinary efforts to strengthen international diplomacy and cooperation between peoples," despite having few if any concrete foreign policy achievements.
Obama could have at least matched Kissinger by ducking the ceremony, or even by refusing it like Lê Đức Thọ did because it wasn't justified.