I'm honestly not a fan. I'm not sure if the site just isn't active enough or what, but I see the same posts over and over again. Doesn't matter whether I'm sorting by active or hot. Is that just me?
Have you tried checking that you have selected "all" or "subscribed" as local sometimes does that. I also play around with "new" and "new replies "to get content to change too.
Best thing you can do is curate your experience by subscribing to the communities that you want to subscribe to and then just sort everything by subscribed and new.