We haven't tried 50's, but I'd like to give it a try someday for lunch. I mostly want to go to see the theming, but not experience it. In other words, I like the 50's theme, but I want a server & only a server. My family doesn't want to be scolded when eating, whether it's in fun or not. I know that doesn't help you though. :0
As far as HBD goes, we ate there last month & it was the best meal of our trip. When we ate there a few years ago, we were less than impressed, but we're glad we finally decided to give it another try. Anyone who hasn't been fairly recently may want to give it another try, before forming or expressing an opinion. You never know, you may love it this time. I do agree that the atmosphere isn't anything special at HBD.