What I can't do is create a topic or keyword, and subscribe to that, with a preference for posts from specific individuals.
Nor can I subscribe to a Community, but only highly ranked posts (useless without downvotes), and/or of people I find compelling.
The Pages route is too many levels of indirection to be successful. Google and Silicon Valley understand that one click can be too much friction, let alone multiple, among several individuals.
I've never subscribed to a page. Hell, what a "page" is is utterly opaque to me (with 25+ years of tech experience).
G+ had a number of useful tools, probably Hangouts at the top of the list, but "Hangouts" UTTERLY FAILS TO COMMUNICATE TO ME what this is. "Group Video Chat" does. And that's what it is.
I've said before and I'll say it again: that should be spun out as its own product, and ultimately be geared to take on WebMeeting and related products.
Edit: Additionally: reddit has ubiquitous RSS. You can tag '.rss' to virtually any URL that's a valid Reddit page (front, subreddit, user, search, URL search etc.) and get a feed based on that. You can also subscribe to specific posts, which is pretty awesome -- through reddit's own notifications system (which blows Google's out of the water).