It is unidiomatic. Leaving aside the age-old quarrel between the "as he" and "as him" camps, the idiom goes "she isn't as good an actor as", not "as good of". You need a capital letter at the beginning and a period at the end, too.
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Emre25Is the following sentence grammatically correct?In my opinion she isn't as good of an actor as him.I would call it 'borderline acceptable'. Here's a better version: