vTube 2 claims to be "a better YouTube app for your iPad." Whether or not that's accurate is another matter entirely, but it definitely sports a rather impressive list of features.
The app offers typical YouTube services and options such as comments and subscriptions, includes an option that lets you listen to the audio from whatever you're watching if it's running in the background, will auto-play videos in fullscreen, and claims to circumvent ads before videos. With more features planed for the future of course.
If you'd like to check it out, you can download vTube 2 off the App Store right now for free.