This is objectively false when you can go to the App Store right now and see that most apps are above a 3.0 meaning more than half rate them positively. People are happy to give good reviews to the ones that deserve it.
One problem is that before I have to close your modal dialog I have probably closed 20-30 other modal dialogs that I never wanted to have open just in the first few hours of the day. I have been using the web all day and people are always trying to steal a little bit of my attention with everybody trick in the book and the one thing that comes across as "luxury" to me is that when you don't do that in any way shape or form.
To be fair, a lot of the problem is applications jumping on you the moment you start them up. It might be that if you work for a company in Silicon Valley you think it just normal to get jumped on by five homeless people in a row as soon as you poke up your head. But sorry, it's not!
Specifically I have this problem with the Creative Cloud Applications that I only used when I am under distress. Like I use Adobe Illustrator for an unpleasant task that I have to do every three months (and have a checklist for now!) or I use Acrobat Pro because I am handling paperwork I am behind on. I want to fight off the demons in my head and get the job done, I do not want to evaluate anything about new features that have been added to the applications. If it had some sense that I'd completed a task and then had a good feeling about the app then yeah, maybe I'd like to hear about a new feature, or maybe put in a good word for your app.
Apple App Review rejected our app for having an unobtrusive message like that in the bottom of the release notes page in the menu of our app. "you're only allowed to solicit reviews through the apple dialog"