Is Mordekaiser OP?

I haven't seen anyone beat him in a single game yet. Every game he does good in he's the carry, if he's not the carry he's not doing bad. He doesn't seem to have the capability to do bad. He's tanky with a huge damage output, his ult denies the kiting that ranged top laners can dish out that sort of combat. I can't fathom who counters him other than an entire team. He can walk into a team in a team fight, ult the adc, and adc is gone.
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