According to Wired, "Apple CEO Steve Jobs has described the App Store as a 'curated platform' that is regulated to ensure a high quality, secure experience for customers."
I wish they would make the App Store's rating process a bit harder for a determined developer to game. I discovered that MAVRO, the company with the bad medical Spanish app, had somehow had my review of their app removed from the App store.
It appears that Apple's iTunes uses a crowd source algorithm to remove reviews, yet has no human beings involved in the process and no checks to assure that a determined developer with sock puppet accounts cannot manipulate the review process.
I resubmitted the review and it was posted again almost immediately. Let's see how long it stays there.