I didn't know much about Bella Ramsey, I'd seen her a few times in Game Of Thrones but that wasn't really my bag. I was a bit on the fence regarding her portrayal as Ellie at first, it took me around 20 minutes of episode two to realise my doubts were misplaced, she's more than holding her own against Pedro Pascal who is outstanding himself.
I understand why some might be apprehensive regarding potential pacing issues, but they've absolutely nailed everything so far, I'll be amazed if they manage to fudge the last two episodes.