For those who says we'll all like it this fall : Design choices are opinions, and our opinion is as legitimate than yours.
Personally, the design choice for notification is really horrible. It feel really bulky, like someone said, it feel like it is a bad jailbreak tweak. Also, it seems harder to read your notification with the transparency. Also, the music app become another all in white app. I begin to be real tired of this boring design choice where many app looks the same with just the blindly white everywhere.
I will try the public beta this july to give it a chance, but if I dont change my mind, it will be the first time since my 3GS I will not update to iOS 10 on release and stay with iOS 9 as long as I can.