Well it really depends on what you can actually call over powered. In some cases I am considered over powered because I have the EMS, Hyouton Kekki Genkai, the 5 tails, and I am a strategist so I analyze my opponents weak points in a fight and I take full advantage of it.
But you can't call someone overpowered who knows their limits and stops before getting too carried away.
Like me I don't activate my EMS until I have to then it makes it hard as hell to hit me. I don't much like using the 5 tails so I don't until someone else uses their Bijuu. But for the Sage mode and all that who ha thats for the birds and there is always a way to beat it you just have to look around the obvious. Just like Pein and his Rinn'negan eyes with all those different realms of his. I know exactly how to beat him and his realms. Because it was pointed out in the manga's if any of you were paying attention to it.