actually, no.. Jinton is not overrated..
first and foremost, Tsunade was the only one giving Onoki chakra.. that is why he said "More Princess!" the 3 other were behind them because they are planning their own attack.. after Onoki's jinton destroyed the 25 Susanoos, he create an opening which launched Mei's massive Water Dragon, infused with Gaara's sand and A's lightning.. that was their plan of attack and formation..
the range and size of the Jinton was more of a credit to Tsunade because it was her chakra that allowed Onoki to perform such a large scale jutsu.. but nevertheless, that fact doesn't change anything in the nature and lethality of Onoki's jinton.. same can be said with Kakashi.. people tends to get awe so much of Kakashi absorbing Gyuki with his Kamui, despite the fact that Kakashi could have never performed such a feat without Kurama lending him some chakra.. but that does not lessens Kakashi's skill with his jutsu nor its effectiveness..
and the most important fact is that Madara is an edo.. Naruto, Kakashi, Bee and Gai was fighting Obito all this time while the 5 Kages delayed Madara for a while.. yes, they failed.. why, simple because they are mortals with limited chakra who is fighting an immortal who possess the abilities of 2 of the most powerful ninjas in history.. most importantly, Madara has acknowledge their power and even said that they are worthy of the Kage name, a title which it seems that even him holds some respect too..
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unlike the two "
Flies" he deems the others to be..
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^_^