several reasons i think google+ is awesome:
-group video chat! it's hard to even get free conference calling anywhere right now, let alone group video chatting. it's free, easy to use, intuitive via google+
-seamless integration with google products, such as google maps, youtube, google docs, gchat, android, gmail etc. facebook lives on an island, and you have to bring all other products into their environment. it's cool to be able to have to access to a bunch of products you already use available right within your social networking app (and I'm sure this aspect of plus will continue to improve as Google continues to integrate other Google products).
-a killer mobile app (much better than facebook), which includes easy group texting, something that isn't easy on mobile right now
-easy managing of social circles, which is an important element of your social life outside of online, and should be easier online (fb does a poor job of this w/ groups). no longer just a definition of who is a 'friend' and who isn't, but sub definitions within that so you can prioritize social information accordingly
-automatic synching of pics/videos you take from your android device to the google+ cloud for easy sharing with circles (obviously doesn't apply for iphone users, as of now)
i am a sucker for google products, and likely have some bias towards them so i understand if you don't take this objectively. but i think as long as google iterates well (which they always seem to do brilliantly) this product has the potential to become even more awesome than it already is.