Could someone explain me why some mid lane mages have pretty low winrates?

I am wondering why champions like viktor, lux, syndra, ryze, have all below 50% winrates, (especially ryze); none of these champ seem weak to me by any means, are they really that weak and i'm missing something or is there something else to it? (I used op.gg as a source) Thanks in advance and sorry for my bad english.
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