Absence of malware does not prove that the AppStore model is superior. It just proves that there is currently no known malware. It is much easier to disprove something (i.e. find malware on the AppStore; therefore the model is flawed) than it is to prove something (i.e. there is no malware on the AppStore; therefore the model is perfect).
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Fact remains: no malware on AppStore.
Absence of malware does not prove that the AppStore model is superior. It just proves that there is currently no known malware. It is much easier to disprove something (i.e. find malware on the AppStore; therefore the model is flawed) than it is to prove something (i.e. there is no malware on the AppStore; therefore the model is perfect).
It also certainly doesn't prove that AppStore's malware filtering is broken. It suggests that it does work, very well.