[jlis]

Most of the times you get so see the rating/review dialogs when the app was updated.

The App Store only shows reviews for the latest release of the app by default, not for all versions combined like the Play Store does.

So if you update your iOS app, there are no reviews displayed in the App Store for your app. To get some reviews for the new version, people show you the rating/review dialog.

At least that's how it was done at LOVOO (disclosure: I worked there). With every new version you'd see the review/rating dialog again.