Is picking a new champion INTing?

So, there's been quite a few Sennas in ranked recently and the results have been... less than impressive. I had a Senna go mid and well... she fed the enemy Yasuo pretty hard. I don't know if she had never played the character before, but it sure seemed that way. So my question is this, is picking a character you've never played before and doing badly with them inting?
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