If by success you mean he said he was going to have a meeting with a N.Korean dictator, and he actually had a meeting with a N.Korean dictator, then I'd call that a success, albeit not an amazing success.
The 2 major winners from that meeting were Kim Jong Un and XI Jinping, and I bet Putin was pretty over the moon too.
Aside from the cheesy photo opportunity, Trump got nothing but an agreement to have another meeting with a view to further discussions on denuclearisation; no mentions of decommissioning their medium and long range ballistic missiles though (unlike the Iran treaty that Trump recently walked away from - so many contradictions; sad).
Kim got recognition and equal footing on the World stage from the POTUS, which is more than Canada got last week by the way, and a verbal agreement to put a stop to the joint S.Korea/US military exercises, which Trump decided to announce after the meeting, to the surprise of everyone else.
If any of the previous POTUS had said they would have a meeting with the N.Korean leader it would have happened; nothing special happened yesterday. Trump was just the first POTUS who wanted the meeting to happen.
Edit - Obama would have met with N.Korea if he hadn't been torn to shreds by firstly Hillary at the 2008 Democrat Primary, then Republicans during the Presidential campaign for even daring to suggest he might.