Anyone who thinks she's a bad actress
Watch the unaired pilot of Buffy the vampire slayer (with somebody else as Willow) and then the final version (with Alyson Hannigan as Willow).
The previous actress didnt do a bad job but OMG is Hannigan better.
Hannigan also does a lot of variants of her character on BtVS. I think in most instances she did that pretty well, too.
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