Today, Apple seeded a new round of betas to developers, including the third builds of iOS 11, macOS 10.13 High Sierra, and tvOS 11. Unfortunately, there's nothing new for watchOS 4, although it could come later today or this week; stranger things have happened.
In the latest iOS 11 build, 15A5318g, many of the known issues have been resolved. Apps like Messenger, Kindle, KakaoTalk, Amazon Video, and Tencent Video should now work as expected, but you might still have issues with DirecTV, Tweetbot, VSCO, Square Cash, and Citi Mobile. If you're a developer, make sure to check out the full list of issues.
macOS 10.13 High Sierra build 17A306f comes with its own list of known and resolved issues. Some iCloud services might not work properly, but the rest of the issues that haven't been fixed seem relatively minor.
You'll find that in tvOS 11 beta 3, or 15J5324f, DirecTV and Sling TV might not work; those are the only app-specific known issues. In fact, most of the issues listed in the release notes have been resolved.
It's now been five weeks since the first developer betas were released, so naturally, a lot of bugs have been fixed and it should be getting easier to use. The updates should be generally available in late September.