I think when Hagane is saying he's overrated, he doesn't mean by fans, he means by Kubo. Because most people don't really give a shit about Ichigo. I think hagane was trying to discuss his power inconsistencies. Kubo overrated him in the fact that he could just about match Kenpachi in shikai, yet almost lose to someone (Grimmjoww) while in Vaizard/Bankai mode who is weaker than the opponent Kenpachi cut down effortlessly (Nnoitra). When comparing Ichigo's fights, then yes it would seem that Kubo overrated his power as certain points, evident when you see inconsistencies with these rating appear.
"Once the threads of fate are tangled, they cannot be undone" R.I.P Kikyou
if ichigo insta-pwned everyone this would turn into yugioh with swords. and yo forgot the fights with kenpachi and ikkaku
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