There are a lot of things people don't love about the Buu Saga, but Vegeta and Goku's growing relationship is the highlight.
Goku has suffered plenty of losses in Dragon Ball, but his worst defeat in DBZ was actually a vital moment for the franchise.
In Dragon Ball Z's Namek/Frieza Saga, Goku first tries to defeat Frieza with his powerful Spirit Bomb attack. However, Frieza was on a different power scale, and Goku would hardly leave Namek ...