I don't see that problem usually, at least when it comes to a single bad performance. It's more of an issue when it comes to the voice actors themselves. Like, I've never seen anyone trash talk the entire dub of Persona 3 because of Fuuka or what have you, but I've seen tons of people give Lee hell for a bad performance.
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I like how each new topic you make reveals such varied facets of your idiocy. - foolmo
Now this is entertainment!