Not Missing, Just Different
There are a handful of features that users initially complained were missing from Google+, but turned out to be handled in a way that they didn't expect. For example, Google+ has no separate messaging system, most likely because Gmail is directly accessible from the black toolbar at the top of the screen. Building and integrating a messaging system seems unnecessary when email access is right there on the screen. Alternatively, it's possible to send a message directly to another user by posting to the stream and only sharing with that one person.
Photo albums, too, are missing some of the tools that users are used to; for example, the ability to quickly and easily change the order of photographs. Again, the explanation is that Google already has an excellent photo management tool in Picassa, and users can open their G+ albums in Picassa to make these kinds of changes. Similarly, event planning is possible - but only via a link to the Google Calendar on the black bar. Again, the functionality is there, but it lacks the slick packaging and fully integrated feel of Facebook's very useful event planning feature.
So the functionality is there; the question is whether users will find the mashup of existing Google tools more unwieldy than a system like Facebook's, where everything is integrated into a single interface.