It's. A. Beta.
Things are buggy, things don't always work, things might always work but not perfectly.
The vast majority of iOS 9's new features are developer facing and we won't get to see them until September. As @dlemaymt said, if you don't see the benefits of iOS 9, restore back to iOS 8.4 and save everyone the hassle of your "iOS 9 beta is ****!" posts.
EDIT: Also, this is like a spring-cleaning year. Every single year, up until now, we've had tons of user facing features. You see all the people (mistakenly, imho) clamouring for iOS 6, as if it wasn't buggy or as if it was completely, totally stable? That'll only get worse if Apple don't slow down, so they are purposely slowing things down a bit, as is clear in both iOS and OS X. In both cases, the added feature list is small, but the overall performance and efficiency are the main areas of focus.
Things are buggy, things don't always work, things might always work but not perfectly.
The vast majority of iOS 9's new features are developer facing and we won't get to see them until September. As @dlemaymt said, if you don't see the benefits of iOS 9, restore back to iOS 8.4 and save everyone the hassle of your "iOS 9 beta is ****!" posts.
EDIT: Also, this is like a spring-cleaning year. Every single year, up until now, we've had tons of user facing features. You see all the people (mistakenly, imho) clamouring for iOS 6, as if it wasn't buggy or as if it was completely, totally stable? That'll only get worse if Apple don't slow down, so they are purposely slowing things down a bit, as is clear in both iOS and OS X. In both cases, the added feature list is small, but the overall performance and efficiency are the main areas of focus.