Are you talking about iPhone or iPad? If iPad...yeah, they started later for the iPad, so, I'm not sure how it will work exactly, but, when they do GM for iPhones, there will either be a beta 7 for iPad or they will do 2 GMs for iPad
If this all happens on your iPhone, then it's either an older model or an older beta, ...beta 6 works pretty well on my iPhone 5...it's a bit glitchy, and can, on occasion, respring itself for no apparent reason, but, not as bad as you state here. Podcasts app was updated and not as buggy as it was. I don't have any major issues with safari, and siri is better with beta 6 than previous betas. Yeah, it's not finished, but, betas are out there for developers to help them get their apps ready for the finished version of iOS 7, not for consumers to evaluate.