#21 The champ retains (WrestleMania 22)
This is a mostly forgotten WrestleMania main event. Compared to the year which preceded it, it was lacking, and compared to the year that followed it, it still didn't hold up as well. Even so, there was nothing inherently bad about this match or ending.
People were getting a bit fatigued with John Cena even at this point, but there's no doubt that WWE made the correct decision in having Triple H pass him the torch here. The apogee and downright ridiculousness of the Super Cena era was still in the future. His run on top was still in its early stages and not entirely secure yet.
The match was average, leading to an average ending, but it was still a crucial crossroads for John Cena's career. This was in fact his first WrestleMania main event, and he did well enough in the role.