All the effort developers are putting into complaining about people on iOS 5 Beta leaving negative reviews could better be spent testing and fixing their app for iOS 5.

Are you going to complain when iOS 5 goes live and your app still isn't ready because you stayed up until 2am writing that blog post rant instead of ironing out that last bug?

Even if Apple blocks iOS 5 devices from leaving reviews, you can still leave a review through iTunes.