Nobody can replicate Shatner and honestly nobody should even try (Chris Pine didn't and it still worked in the movies). I will say that Wesley's appearance as Kirk was kind of jarring for me in that episode when first introduced, but it sort of worked for me by the end.
I don't think I'll have any issue with it in S2, though I don't think he was anywhere near the best casting choice they could have made with this character.
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