I don't like it at all. Not only in it's history it had tons of problems - for me their crap browser requires tons of page reloads just to successfully load a page, but mainly the completely useless layer you need to run just to play games. I personally can't see any real advantages using it, over integrating stuff in web server and loading specific functions in game only - like Battle.net. Sure you have some extra buttonz in browser, but not anything better than simple bookmark you can use everywhere, and you can chat with peoplz that are not logged in any game yet. Nothing worth running another layer that is actually not even fast or lightweight at all.
But WTH, this sits perfectly with the trend in industry, where the better hardware we have, the more inefficient is our work.