That you know off. The security is provided by the operating system, not the review process. The last layer, and that's the most efficient one, which exists on most systems is you by choosing what you install (most because some phones/computers manufacturers adds pre-installed crapwares)

I can tell you that across all my devices I don't think any malicious apps made its way there neither (as for you with your ios device, I will never be entirely sure). And this, without apple random reviews.