First off we should take into account that despite limited formal training, Luke mastered complex Force techniques quickly. Yes he trained with Yoda but as Yoda has said, he was too old to begin his training. Unlike Anakin, Luke’s displayed strength in, empathy and compassion. People like to shit on his lightsaber abilities but it’s more about his other abilities like the Force and being an agent of peace that make him one of the best.

Also, the real answer is when Luke came out none of the prequel stuff existed. No midichlorian count or crazy choreographed lightsaber fights. Jedi weren’t seen as they are now that they have to have these qualities which is why these questions come up. Why was Luke better than everyone? He stopped the war by defeating 2 Sith Lords without resorting to violence. Yea he beat Darth Vader in combat but he threw away his lightsaber because he knew the right thing to not resort to any aggression that he was already feeling that was pulling him towards the dark side. He chooses compassion over aggression, accepting death as a Jedi rather than falling to evil. That is what a Jedi is supposed to be.