Jiraiya was powerful enough that even Kisame and Itachi acknowledged that the best they could achieve together was a stalemate. Nagato defeated Jiraiya because Jiraiya didn't know the secret of his paths; Nagato said so himself. Nagato underestimated Jiraiya's genjutsu capabilities.
Minato was also one of the strongest ninja ever in existence. To those who underestimate Jiraiya and Minato, that's a mistake. Minato was able to defeat Tobi; no contemporary shinobi have even hit or threatened Tobi so far in the manga besides Konan. On top of this; this wasn't just a one on one fight. Minato was able to fight the full powered Kurama, Tobi, whilst saving and protecting Naruto and Kushina. To say that Minato is overrated would just plainly be stupid.
The same goes for Jiraiya.
Minato was also one of the strongest ninja ever in existence. To those who underestimate Jiraiya and Minato, that's a mistake. Minato was able to defeat Tobi; no contemporary shinobi have even hit or threatened Tobi so far in the manga besides Konan. On top of this; this wasn't just a one on one fight. Minato was able to fight the full powered Kurama, Tobi, whilst saving and protecting Naruto and Kushina. To say that Minato is overrated would just plainly be stupid.
The same goes for Jiraiya.