Google Plus and Facebook are good to share content, but it shouldn’t live there. For a WordPress-based blog, integrating Facebook’s Open Graph metadata helps both the G+ and FB crawlers to display a good preview for your posts. A plugin that does a good job with that is WP Facebook Open Graph protocol. For links to posts, it generates an excerpt to use as the description, and will look for images inside that post, which always helps to decorate shares.
As far as I can tell, there’s not much of a drawback for adding that plugin. It just adds a few meta elements, based on content that’s in the html anyway.