In what context did you find this sentence? It could possibly mean that everything about you is wonderful, except your grammar . ( With me, it's the opposite!
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Anonymous"Only in grammar can you be more than perfect"= You can be more than perfect in grammar, but not in anything else.
Anonymousonly in grammar can you be more than perfectIt's hard to say what this means. It might be a reference to the use of highly formal forms or to hypercorrection.
It is a joke on the pluperfect tense. The word pluperfect derives from the Latin plus quam perfectum, or "more than perfect".