Agreed. I think Google has enough interaction data (between +1's, comments, and shares) to know what the top posts in any community are. They need to slap the volume control slider that they use on other parts of the site onto the community pages to make it easy to view the top 10, 50, or ... recent posts. Similarly, it would be nice if they allowed the cream of the crop posts from the communities to bleed through to the main page. Discoverability of communities needs a lot of work to, but that's another comment. :)