How is Mord busted?

Don't jump on me for this, I'm genuinely curious. I've only played him twice, but both times I felt the match was fair. I went vs Irelia and a Nasus. I didn't steam roll either one, or anyone on their team. I got kills and got killed pretty evenly. Maybe I need to learn his kit better, but it seems pretty straight forward. Is he really busted or are people just crying for nothing?
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