That's all Yuzu being Yuzu though, not the VA doing poorly. If anything I'd say she's working off of what she's got perfectly!
(seriously, Yuzu is a pretty large fail compared to most characters Atlus has put out, so having her voiced just made it all the more obvious)
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Currently playing: League of Legends, Chrono Cross.
Current Projects: Fool's Overture, CYOA: http://www.gamefaqs.com/boards/8-gamefaqs-contests/60143513